Cleaning piano, languishing around (7)
I believe the answer is:
mopping
'cleaning' is the definition.
(I know that mopping is a type of scouring)
'piano languishing around' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'languishing' becomes 'moping' (I am not sure about this - if you are sure you should believe this answer much more).
'around' means one lot of letters goes inside another.
'p' going within 'moping' is 'MOPPING'.
Can you help me to learn more?
(Another definition for mopping that I've seen is " Cleaning up".)