Jazz musician misses entry? Help! (6)
I believe the answer is:
assist
'help' is the definition.
(to assist someone is to help them)
'jazz musician misses entry?' is the wordplay.
'jazz musician' becomes 'bassist' (double bass player).
'misses entry?' means to remove the first letter.
'bassist' with its initial letter taken off is 'ASSIST'.
(Other definitions for assist that I've seen before include "Help, lend a hand" , "Pass to scorer" , "Give help" , "Understand by instinct" , "Serve" .)