Crossword Genius

Something to drink on a motorbike? (7)

Ross

I believe the answer is:

sidecar

I'm a little stuck... Click here to teach me more about this clue!

'drink on a motorbike?' is the definition.
'sidecar' can be an answer for 'drink' (sidecar is a kind of drink). I'm unsure of the 'on a motorbike?' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sidecar that I've seen before include "Where a passenger may go" , "Tipple" , "Passenger carrier attached to a motorcycle" , "Is raced (anag.)" , "One-wheeled compartment attached to a motorcycle" .)

I've seen this clue in the Evening Standard.
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