Smart operator hoarding booze (4)
I believe the answer is:
tope
'booze' is the definition.
(thesaurus)
'smart operator hoarding' is the wordplay.
'hoarding' indicates the answer is hidden within the clue.
'TOPE' is hidden in the letters of 'smart operator'.
(Other definitions for tope that I've seen before include "Drink hard regularly" , "Drink too much like poet" , "Drink a lot like poet" , "Small grey requiem shark" , "Drink heavily" .)