Drunken ingrate in full pub (8,4)
I believe the answer is:
watering hole
'pub' is the definition.
(I've seen this before)
'drunken ingrate in full' is the wordplay.
'drunken' indicates anagramming the letters.
'in' is an insertion indicator.
'full' becomes 'whole' (similar in meaning).
'ingrate' anagrammed gives 'atering'.
'atering' going within 'whole' is 'WATERING-HOLE'.
(Other definitions for watering hole that I've seen before include "Employer of barmaid" , "Public house (found in a desert?)" , "Pool" , "bar" , "pub" .)