The most common and most likely answer to this crossword clue is the 11 letter word FAIRGROUNDS
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Buddy explains!

The straight part
We know that "amusement parks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case amusement parks = fairgrounds.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does FAIRGROUNDS mean?
FAIRGROUNDS noun- An area where a fair (an event for public entertainment) or other public event is held; a showground.
- A commercially-operated collection of rides, games and other entertainment attractions; an amusement park.
- An area where a fair (an event for public entertainment) or other public event is held; a showground.
- A commercially-operated collection of rides, games and other entertainment attractions; an amusement park.