Thus have time to get drunk (3)
I believe the answer is:
sot
'drunk' is the definition.
(both can mean someone who drinks too much)
'thus have time' is the wordplay.
'thus' becomes 'so' (synonyms).
'have' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'so'+'t'='SOT'
'to get' acts as a link.
(Other definitions for sot that I've seen before include "Toper" , "Habitual drunkard" , "Habitual drinker" , "Boozer" , "Lush" .)