Questions & Answers about Hvis håndtaget sidder løst, må vi ringe til en håndværker.
Hvis means if and introduces a condition.
So Hvis håndtaget sidder løst is the if-clause: it sets up the situation under which the next thing happens.
It is a subordinate clause, which matters for word order in the rest of the sentence.
The basic noun is et håndtag, meaning a handle.
Danish adds -et to many neuter nouns to make them definite singular:
- et håndtag = a handle
- håndtaget = the handle
So håndtaget is used because the sentence is talking about a specific handle, not just any handle.