Round pound (4)
I believe the answer is:
beat
I believe this clue is a double definition.
'round' is the first definition.
('beat' can be a synonym of 'round')
'pound' is the second definition.
('beat' can be a synonym of 'pound')
(Other definitions for beat that I've seen before include "course run regularly" , "Strike; rhythm" , "Rhythm, stir vigorously" , "Worst round" , "Musical rhythm" .)