Help needed after audition for trumpet? (7,3)
I believe the answer is:
hearing aid
'trumpet?' is the definition.
(a hearing trumpet is a type of hearing aid)
'help needed after audition' is the wordplay.
'help' becomes 'aid' ('aid' can be a synonym of 'help').
'needed after' means one lot of letters go next to another.
'audition' becomes 'hearing' ('hearing' can be a synonym of 'audition').
'aid' put after 'hearing' is 'HEARING-AID'.
'for' is the link.
(Other definitions for hearing aid that I've seen before include "asset in court?" , "Earpiece" , "Help for the partially deaf" , "Ear trumpet" , "Amplifier for ear" .)