Teases bits of old cloth (4)
I believe the answer is:
rags
'teases' is the definition.
('rag' can be a synonym of 'tease')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rags that I've seen before include "Small bits of waste cloth" , "Tattered clothes" , "Small pieces of cloth (but can be glad)" , "Tattered cloths" , "Waste scraps of cloth" .)