It's cooked - or drunk! (6)
I believe the answer is:
stewed
This clue is a double definition.
'it's cooked' is the first definition.
(stewing is a kind of cooking)
'drunk' is the second definition.
(I've seen this before)
'or' acts as a link.
(Other definitions for stewed that I've seen before include "Was long embarrassed" , "Drunk; cooked in pot" , "Cooked (prunes?)" , "Of tea, infused too long" , "Slowly boiled" .)