A little merry, enjoying whisky (3)
I believe the answer is:
rye
'whisky' is the definition.
(rye whisky is a kind of whisky)
'a little merry enjoying' is the wordplay.
'a little' indicates a hidden word.
'RYE' is hidden in the letters of 'merry enjoying'.
(Other definitions for rye that I've seen before include "place in East Sussex" , "Grain crop" , "Wheat-like cereal plant" , "old port" , "Gypsy gentleman" .)