Ready to pour (2,3)

I think it could be either:

Which length description are you looking for?:

2,3

2,5

on tap

'ready to pour' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for on tap that I've seen before include "Where to find a washer" , "Of liquid gas, ready to be drawn off" , "where C or H is seen?" , "Immediately available like beer in pub" , "Ready for immediate use" .)

I've seen this clue in The New York Times and the Universal.

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