Fight a lot to get some rubbish (9)
I believe the answer is:
scrapheap
'some rubbish' is the definition.
Although both the answer and definition are singular nouns, I can'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' acts as a link.
Can you help me to learn more?
(Other definitions for scrapheap that I've seen before include "Waste pile" , "Pile of discarded metal" , "Where unwanted items end up" , "Pile of discarded items" , "Junk" .)