Master has no piano to put to use (5)
I believe the answer is:
exert
'put to use' is the definition.
(exerting is a kind of putting to use)
'master has no piano' is the wordplay.
'master' becomes 'expert' (I've seen this before).
'has no' indicates named letters should be taken away.
'piano' becomes 'p' (musical abbreviation).
'expert' with 'p' taken out is 'EXERT'.
'to' acts as a link.
(Other definitions for exert that I've seen before include "Bring (force) to bear" , "Employ" , "Bring into use, apply" , "Put to use, vigorously" , "Work very hard" .)