Turn to cleaner for snack (7)
I believe the answer is:
rollmop
'snack' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?
'turn to cleaner' is the wordplay.
'turn' becomes 'roll' (rolling is a kind of turning).
'to cleaner' becomes 'mop' (something which 'cleans').
'roll'+'mop'='ROLLMOP'
'for' is the link.
Can you help me to learn more?
(Other definitions for rollmop that I've seen before include "Dish of herring fillet" , "Herring pickled in spiced vinegar" , "Pickled herring wrapped around onion slices" , "Curled-up herring fillet" , "Ex-swimmer preserved" .)