Quarrels for left-overs? (6)
I believe the answer is:
scraps
'quarrels' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for scraps that I've seen before include "Fragments left over (6)" , "Remnants" , "Pieces of uneaten food" , "thrown away?" , "useless bits" .)