Their falling would ruin acts perhaps (8)

I believe the answer is:

curtains

I'm a little stuck... Click here to teach me more about this clue!

'their falling would' is the definition.
I can't judge whether this defines the answer.

'ruin acts perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'ruin'+'acts'='ruinacts'
'ruinacts' with letters rearranged gives 'CURTAINS'.

Can you help me to learn more?

(Other definitions for curtains that I've seen before include "Hanging cloths" , "for Windows" , "Window drapes in slangy ending" , "Draperies" , "Window hangings" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.