Musician's piano brought into wharf (5)
I believe the answer is:
piper
'musician's' is the definition.
(someone playing the bagpipes)
'piano brought into wharf' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'brought into' is an insertion indicator.
'wharf' becomes 'pier' (I've seen this before).
'p' going into 'pier' is 'PIPER'.
(Other definitions for piper that I've seen before include "oil and gas field" , "Musical blower" , "Artist known for his stained glass in Coventry Cathedral, d. 1992" , "'Liam O'Flynn or Seamus Ennis, say (5)'" , "John --, 20th century English artist" .)