Musical measures (4)
I believe the answer is:
bars
'musical measures' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bars that I've seen before include "Rods or drink dispensers" , "Watering holes - units in musical scores" , "Establishments where alcoholic drinks are served" , "where people get drunk" , "Drinking holes; prohibits" .)