Fish always smothered in mint dip (6,4)
I believe the answer is:
bombay duck
'fish' is the definition.
(I've seen this before)
'always smothered in mint dip' is the wordplay.
'always' becomes 'ay' (archaic term for 'always').
'smothered in' means one lot of letters goes inside another (I've seen this in other clues).
'mint' becomes 'bomb' (both can informally mean a lot of money).
'dip' becomes 'duck' (synonyms).
'bomb'+'duck'='bombduck'
'ay' put within 'bombduck' is 'BOMBAY DUCK'.
(Other definitions for bombay duck that I've seen before include "Small Indian fish" , "Poor batting performance at Mumbai" , "one being caught in the deep?" , "Dried curried fish" , "Dried fish dish" .)