Downing drink, eat up stew (6)
I believe the answer is:
tagine
'stew' is the definition.
(I've seen this before)
'downing drink eat up' is the wordplay.
'downing' means one lot of letters goes inside another (to down food or drink is to swallow it quickly).
'drink' becomes 'gin' (gin is an alcoholic drink).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'eat' backwards is 'tae'.
'gin' placed within 'tae' is 'TAGINE'.
(Another definition for tagine that I've seen is " Moroccan stew cooked in a pot with a conical lid".)