Crossword Genius

One's often high during a performance but down after the show (7)

Ross

I believe the answer is:

curtain

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'one's often high during a performance' is the definition.

I cannot understand how the remainder of the clue works.

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(Other definitions for curtain that I've seen before include "It can be drawn" , "Cover for window etc" , "Hanging, window cover" , "Window drape" , "It's raised before the start of a play" .)

I've seen this clue in The Telegraph.
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