Freely available (2,3)

I think it could be either:

Which length description are you looking for?:

2,3

on tap

'freely available' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for on tap that I've seen before include "Where to find a washer" , "Constantly available like beer from keg" , "kept in a cask" , "Available whenever needed" , "Ready to be drawn off, say beer" .)

I've seen this clue in The Guardian and The Sun.

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