Waste scrap of cloth (3)
I believe the answer is:
rag
'waste scrap of cloth' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rag that I've seen before include "Scrap of old cloth" , "Piece of music" , "Piece of cloth for student's fun" , "Tease" , "students' excuse to misbehave?" .)