Prohibition, as related to alcoholic drink (3)

I believe the answer is:

bar

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'prohibition' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for bar that I've seen before include "Drinking place - lawyers!" , "Counter in 21" , "Prohibit; counter" , "measure of pressure" , "Obstacle" .)

I've seen this clue in the Evening Standard.

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