Bragged about scrap (3)
I believe the answer is:
rag
'scrap' is the definition.
(both can mean a piece of material)
'bragged about' is the wordplay.
'about' indicates a hidden word (the clue goes around or about the answer).
'RAG' is hidden in the letters of 'bragged'.
(Other definitions for rag that I've seen before include "Practical joke" , "Tatter; make fun of" , "Waste scrap of cloth" , "Scrap -student carnival" , "Bit of material" .)