Crossword Genius

On which to drink Adam's ale (5)

Ross

I believe the answer is:

wagon

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

'drink adam's ale' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'on which' is the wordplay.
I cannot really see how this works, but
'on' is within the answer.
The remaining letters 'wag' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

(Other definitions for wagon that I've seen before include "Vehicle (on which abstainers travel?)" , "Railway freight vehicle" , "Trailer, railway truck" , "Vehicle for transporting goods" , "Cart; rail truck" .)

I've seen this clue in the Evening Standard.
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