Parquet floor’s finish getting damaged on shifting piano a fraction (7)
I believe the answer is:
quarter
'fraction' is the definition.
(quartering is a kind of fractioning)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for quarter that I've seen before include "A fourth - city district" , "Clemency" , "Area of town; mercy" , "Town district" , "Mercy; fraction" .)