Pub with ale gone unfortunately, last of bitter drunk (8,4)
I believe the answer is:
watering hole
'pub' is the definition.
(I've seen this before)
'with ale gone unfortunately last of bitter drunk' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'last of' indicates one should take the final letters.
'drunk' means one lot of letters goes inside another (inserted letters are drunk in).
The last letter of 'bitter' is 'r'.
'with'+'ale'+'gone'='withalegone'
'withalegone' is an anagram of 'wateinghole'.
'wateinghole' enclosing 'r' is 'WATERING HOLE'.
(Other definitions for watering hole that I've seen before include "bar" , "Pool" , "Public house (found in a desert?)" , "where to get a drink" , "pub" .)