Bravo! Help for member of the band (7)
I believe the answer is:
'member of the band' is the definition.
(bass guitar player)
'bravo help' is the wordplay.
'bravo' becomes 'b' (phonetic alphabet: alpha, bravo, charlie etc.).
'help' becomes 'assist' (to assist someone is to help them).
'for' acts as a link.
(Other definitions for bassist that I've seen before include "Musician" , "jazz player" .)