Piano to the right of china mug (5)
I believe the answer is:
chump
'mug' is the definition.
(synonyms)
'piano to the right of china' is the wordplay.
'piano' becomes 'p'.
'to the right of' is a charade indicator (letters next to each other).
'china' becomes 'chum' (china [plate] is Cockney rhyming slang for mate).
'p' put after 'chum' is 'CHUMP'.
(Other definitions for chump that I've seen before include "Nitwit" , "Fool - end piece of meat" , "Foolish person" , "Blockhead" , "Fool - sort of chop" .)