Crossword Genius

One pub that’s free (5)

Ross

I believe the answer is:

unbar

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

'one pub' is the wordplay.
'one' becomes 'un' (northern English dialect form of 'one').
'pub' becomes 'bar' (I've seen this before).
'un'+'bar'='UNBAR'

'that's' acts as a link.

(Another definition for unbar that I've seen is " Free".)

I've seen this clue in The Guardian.
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