Fight a lot to get some garbage (9)
I believe the answer is:
scrapheap
'some garbage' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'fight a lot' is the wordplay.
'fight' becomes 'scrap' (a scrap is a minor fight).
'a lot' becomes 'heap' (synonyms).
'scrap'+'heap'='SCRAPHEAP'
'to get' is the link.
Can you help me to learn more?
(Other definitions for scrapheap that I've seen before include "Discard pile" , "Pile of discarded metal" , "Junk" , "Place for useless or redundant people or things" , "Pile of discarded items" .)