Cocktail a motorcyclist may have (7)

I believe the answer is:

sidecar

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sidecar that I've seen before include "Motorcycle add-on" , "Attachment to motor cycle" , "Motorcycle accessory -- cocktail" , "Vehicle" , "Attachment on motorcycle to carry passenger" .)

I've seen this clue in the Evening Standard.

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