A little music in the pub (3)
I believe the answer is:
bar
I believe this is a double definition.
'a little music' is the first definition.
(a bar of music)
'the pub' is the second definition.
(both are drinking establishments)
'in' is the link.
(Other definitions for bar that I've seen before include "Counter; ban" , "Pub; ban" , "Local" , "sovereign" , "Sandbank; drinking place" .)