Exposed shoulder in audition (4)
I believe the answer is:
bare
'exposed' is the definition.
(I've seen this in another clue)
'shoulder in audition' is the wordplay.
'shoulder' becomes 'bear' (I've seen this before).
'in audition' indicates a 'sounds like' (homophone) clue (audition can mean hearing).
'bear' is a homophone of 'BARE'.
(Other definitions for bare that I've seen before include "Unclad" , "Not clothed" , "Unadorned - naked" , "Nude; uncover" , "Not covered" .)