Evidence of lower waste? (6)
I believe the answer is:
cowpat
'evidence' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?
'lower waste?' is the wordplay.
'lower' becomes 'cow' (something which lows - makes cow sounds).
'waste?' becomes 'pat' (I can't justify this - if you can you should believe this answer much more).
'cow'+'pat'='COWPAT'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for cowpat that I've seen before include "Brown deposit in a field?" , "Piece of cattle dung" , "You don't want to put your foot in it" , "Bovine dung" , "'In a field, one might step in one (6)'" .)