Fallet är tydligt.

Because fall is a neuter noun in Swedish, and -et is the usual definite singular ending for many neuter nouns.

So:

• ett fall = a case / a fall
• fallet = the case / the fall

In this sentence, fallet is definite, so it means the case rather than a case.

Fall is an ett-word, meaning it has neuter gender.

You can see that from its indefinite form:

• ett fall = a case

This matters because Swedish adjectives often change form depending on whether the noun is common gender, neuter, or plural.

Because the subject, fallet, is neuter singular.

The adjective tydlig changes like this:

• tydlig = common gender singular
• tydligt = neuter singular
• tydliga = plural

Since fallet is a neuter singular noun, the adjective becomes tydligt.

Compare:

• Boken är tydlig. = The book is clear.
• Fallet är tydligt. = The case is clear.
• Frågorna är tydliga. = The questions are clear.

Because tydligt is a predicative adjective, not an adjective placed directly before the noun.

In Swedish, predicative adjectives usually agree with gender and number, but not with definiteness.

So:

• det tydliga fallet = the clear case
  
  • here the adjective comes before the noun, so it takes the definite/plural form tydliga
• fallet är tydligt = the case is clear
  
  • here the adjective comes after är, so it takes the neuter singular form tydligt

This is a very common pattern in Swedish.

Är is the present tense of vara, which means to be.

So:

• är = is / are

In this sentence:

• Fallet är tydligt. = The case is clear.

Some useful forms of vara are:

• är = is / are
• var = was / were
• vara = be / to be
• varit = been

Yes. This is the normal basic word order for a simple statement:

• Subject + verb + complement

So here:

• Fallet = subject
• är = verb
• tydligt = subject complement / predicative adjective

That is very similar to English:

• The case
  • is
    • clear

Not necessarily. Fall can mean different things depending on context, such as:

• case
• instance
• fall

So fallet could mean:

• the case in a legal or investigative sense
• the case in the sense of a situation or matter
• sometimes even the fall, depending on context

Since you said the meaning is already shown to the learner, the important thing is that the grammar stays the same whichever meaning is intended.

Yes, but it means something slightly different.

• Fallet är tydligt. = The case is clear.
• Det är tydligt. = It is clear. / That is clear.

With fallet är tydligt, you name exactly what is clear: the case.

With det är tydligt, you make a more general statement without naming the thing directly.

A careful approximation is TY-dee-lit.

A few things to notice:

• ty- has a Swedish vowel sound that does not exist naturally in standard English
• the d is pronounced
• the final -gt in tydligt is often pronounced more smoothly than an English speaker might expect

If you are a beginner, it is enough at first to aim for something like:

• TYD-ligt

But it is worth listening to native audio, because Swedish vowel quality is very important.

More or less, yes:

• Fallet = the case
• är = is
• tydligt = clear

So the structure matches English quite closely.

However, remember that Swedish adjective endings carry grammar that English does not show. English keeps clear the same, but Swedish changes tydlig to tydligt because fallet is neuter singular.

The indefinite version would be:

• Ett fall är tydligt.

That means A case is clear.

Compare:

• ett fall = a case
• fallet = the case

The adjective stays tydligt in both sentences because fall is still neuter singular.

The plural would be:

• Fallen är tydliga. = The cases are clear.

Here the changes are:

• fallet → fallen for definite plural
• tydligt → tydliga because plural adjectives use -a

So the pattern is:

• fallet är tydligt = singular neuter
• fallen är tydliga = plural