A scarf unravelled, for scrap (6)
I believe the answer is:
fracas
'scrap' is the definition.
(I've seen this before)
'a scarf unravelled' is the wordplay.
'unravelled' indicates an anagram.
'a'+'scarf'='ascarf'
'ascarf' with letters rearranged gives 'FRACAS'.
'for' acts as a link.
(Other definitions for fracas that I've seen before include "Scrap" , "Dispute" , "Brawl, disturbance" , "Brawl; scuffle" , "Bust-up" .)