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Freely available, like H or C (2,3)

Ross

I believe the answer is:

on tap

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

I don't understand how the remainder of the clue works.

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(Other definitions for on tap that I've seen before include "where C or H is seen?" , "Readily available" , "Immediately available like beer in pub" , "Ready for immediate use" , "Always available" .)

I've seen this clue in the Evening Standard.
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