Abandoned ale, quit liquor (7)
I believe the answer is:
tequila
'liquor' is the definition.
(tequila is a kind of liquor)
'abandoned ale quit' is the wordplay.
'abandoned' is an anagram indicator.
'ale'+'quit'='alequit'
'alequit' is an anagram of 'TEQUILA'.
(Other definitions for tequila that I've seen before include "Equal it! (anag)" , "Liquor made from the agave plant" , "Is there another drink to equal it?" , "Mexican alcoholic drink" , "Mexican agave spirit" .)