Brandy cocktail (7)
I believe the answer is:
sidecar
'brandy cocktail' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sidecar that I've seen before include "Motorcycle addition" , "that biker may take with him" , "Motorcycle add-on" , "Motorbike passenger attachment" , "Tipple" .)