Notice third character in audition? (3)
I believe the answer is:
see
'notice' is the definition.
(thesaurus)
'third character in audition?' is the wordplay.
'third character' becomes 'c' (third letter of the alphabet).
'in audition?' indicates a 'sounds like' (homophone) clue (audition can mean hearing).
'c' sounds like 'SEE'.
(Other definitions for see that I've seen before include "Up-and-down motion" , "Look at the bishop's domain" , "Go out with; notice" , "... have interview with" , "date" .)