Tree whose berries flavor gin (7)
I believe the answer is:
juniper
'tree whose berries flavor gin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for juniper that I've seen before include "Coniferous shrub with berries used to make gin" , "Shrub providing flavour for gin" , "Shrub with berries used to flavour gin" , "Its cones are used to flavour gin" , "Plant producing berries used to flavour gin" .)