Go in front of piano and go back (7)
I believe the answer is:
precede
'go in front' is the definition.
(I've seen this before)
'piano and go back' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'and' means one lot of letters go next to another.
'go back' becomes 'recede' (I've seen this before).
'p'+'recede'='PRECEDE'
'of' is the link.
(Other definitions for precede that I've seen before include "Antedate" , "Forerun" , "be in the van" , "Come or go before" , "go before the others" .)