A bit of pressure to refuse (3)

I believe the answer is:

bar

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'refuse' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for bar that I've seen before include "Sandbank; pub counter" , "sovereign" , "Lawyers may be called to it" , "Counter for serving drink" , "Barrier; pressure unit" .)

I've seen this clue in the Sydney Morning Herald.

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