Crossword Genius

Cocktail attachment (7)

Ross

I believe the answer is:

sidecar

I believe this clue is a double definition.

'cocktail' is the first definition.
(I know that sidecar is a type of cocktail)

'attachment' is the second definition.
(vehicle attached to the side of another)

(Other definitions for sidecar that I've seen before include "Tipple" , "Attachment to motorcycle to accommodate passenger" , "Cocktail; bike attachment" , "Passenger carrier attached to a motorcycle" , "Motorcycle accessory -- cocktail" .)

I've seen this clue in The Guardian.
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