Learn Turkish: Sirk, çocuklar için büyüleyici bir yer. - The circus is a fascinating place for children.

It is built from the root noun büyü (magic or spell). Adding the suffix -le creates the verb büyülemek (to enchant), and the suffix -(y)ici turns that verb into an active adjective, giving us büyüleyici (fascinating or enchanting).

Is it okay to say bir büyüleyici yer instead of büyüleyici bir yer?

No, that would sound unnatural. In Turkish, when a noun has both a descriptive adjective and the indefinite article bir (a/an), the adjective almost always comes first. The standard order is Adjective + bir + Noun, so it translates literally as 'fascinating a place'. This is a common rule learners mix up, but it is standard for Turkish phrasing.

What is the purpose of the comma after Sirk?

Since this is a nominal sentence (a sentence without an action verb at the end), the comma is used to clearly mark Sirk (the circus) as the subject. It separates the subject from its description, ensuring the reader doesn't accidentally run the words together.