Finished in audition for cast (5)
I believe the answer is:
threw
'cast' is the definition.
(I've seen this before)
'finished in audition' is the wordplay.
'finished' becomes 'through' ('through' can be similar in meaning to 'finished').
'in audition' indicates a 'sounds like' (homophone) clue (audition can mean hearing).
'through' is a homophone of 'THREW'.
'for' is the link.
(Other definitions for threw that I've seen before include "Chucked" , "Bowled unfairly" , "Cast" , "Formed (pot) on wheel" , "Confused" .)