Go before or quietly go back? (7)
I believe the answer is:
precede
'go before' is the definition.
(I've seen this before)
'quietly go back?' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'go back?' becomes 'recede' (going back is a kind of receding).
'p'+'recede'='PRECEDE'
'or' acts as a link.
(Other definitions for precede that I've seen before include "Go before in time or order" , "Having to come in front" , "Go before (someone)" , "Pave the way" , "go before the others" .)