Player primarily on bench, or in second team? (6)
I believe the answer is:
oboist
'player' is the definition.
(oboist is a kind of player)
'primarily on bench or in second team?' is the wordplay.
'primarily' suggests taking the first letters.
The first letters of 'on bench or in second team' is 'OBOIST'.
(Other definitions for oboist that I've seen before include "Instrumentalist" , "Do I boost the musician?" , "orchestra member" , "Wind player" , "Musician who plays woodwind of treble pitch" .)