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