Was it exclusive in Prohibition? (3)

I believe the answer is:

bar

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'prohibition?' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for bar that I've seen before include "Lawyers collectively" , "Support (for a drinker?)" , "Shut out" , "Counter; pressure unit" , "Pub room; sandbank" .)

I've seen this clue in the Evening Standard.

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