What’s often found in pub with no round left fit for drinking (7)

I believe the answer is:

potable

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'fit for drinking' is the definition.
(I've seen this before)

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

(Other definitions for potable that I've seen before include "Fit to drink" , "having healthy water quality" , "Drinkable" , "may be drunk" , "Non-toxic" .)

I've seen this clue in The Times.

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