Fishy food discovered by cleaner in expensive car (8)
I believe the answer is:
rollmops
'fishy food discovered' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'cleaner in expensive car' is the wordplay.
'cleaner' becomes 'mop' (something which 'cleans').
'in' means one lot of letters goes inside another.
'expensive car' becomes 'rolls' (short for Rolls Royce).
'mop' placed within 'rolls' is 'ROLLMOPS'.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for rollmops that I've seen before include "Raw herring fillets" , "Rolled and pickled herring fillets" , "Pickled herrings" , "fishy concoctions" , "pickled fish" .)