A drop one can get in a bar (5)

I believe the answer is:

minim

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'a drop' is the definition.
(thesaurus)

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

(Other definitions for minim that I've seen before include "Half-semibreve" , "It's a downward stroke" , "Feature of a score" , "Half-note" , "Two crotchets in one" .)

I've seen this clue in the Evening Standard.

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