Grog ingredient (3)
I believe the answer is:
rum
'grog ingredient' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rum that I've seen before include "Droll" , "Strange drink from molasses" , "Odd sort of spirit used in grog" , "Peculiar like sailor's drink (3)" , "Queer" .)