Dusting cloth (3)
I believe the answer is:
rag
'dusting cloth' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rag that I've seen before include "Student fundraiser" , "Syncopated piano music" , "This trade is the clothing business" , "A tattered cloth or university frolic" , "Disreputable paper" .)