Carry a note into a bar (4)
I believe the answer is:
bear
'carry' is the definition.
(bear can mean to transport or carry)
'a note into a bar' is the wordplay.
'a note' becomes 'e' (musical note).
'into' means one lot of letters goes inside another.
'e' going within 'bar' is 'BEAR'.
(Other definitions for bear that I've seen before include "Carry - teddy" , "Large carnivore" , "Situation where there are more sellers than willing buyers" , "rude fellow" , "Carry; large animal" .)