Crossword Genius

Funny reason one can’t get into the theatre for audition? (7)

Ross

I believe the answer is:

playful

'funny' is the definition.
(funny can mean playful or light-hearted)

I cannot understand how the remainder of the clue works.

(Other definitions for playful that I've seen before include "Lively" , "In high spirits" , "Frisky" , "Frolicsome" , "Teasing, unserious" .)

I've seen this clue in The Times.
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