Turn to cleaner for a snack (7)
I believe the answer is:
rollmop
'a snack' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?
'turn to cleaner' is the wordplay.
'turn' becomes 'roll' (roll is a kind of turn).
'to cleaner' becomes 'mop' (something which 'cleans').
'roll'+'mop'='ROLLMOP'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for rollmop that I've seen before include "Pickled herring wrapped around onion slices" , "Food" , "swimmer that's soused" , "savoury dish" , "Fish" .)