Key helps musicians (8)

I believe the answer is:

bassists

'musicians' is the definition.
(I've seen this before)

'key helps' is the wordplay.
'key' becomes 'b' (eg B major, musical key).
'helps' becomes 'assists' (assisting is a kind of helping).
'b'+'assists'='BASSISTS'

(Another definition for bassists that I've seen is " musicians".)

I've seen this clue in The Daily Express.

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