Part of the arrangements for audition (3)
I believe the answer is:
ear
'audition' is the definition.
(ear is a kind of audition)
'part of the arrangements for' is the wordplay.
'part of' says the answer is hidden in the clue.
'EAR' is hidden in the letters of 'the arrangements for'.
(Other definitions for ear that I've seen before include "'Give every man thine ..., but few thy voice'/Hamlet" , "Aural organ" , "Auditory organ" , "Attention; an organ" , "Musical ability" .)