Circuits (4)
I believe the answer is:
laps
'circuits' is the definition.
('lap' can be a synonym of 'circuit')
This is all the clue.
(Other definitions for laps that I've seen before include "Circuits of a racetrack" , "Circuits of track" , "Drinks; circuits" , "Scoops up with the tongue" , "Pals doing rounds of the track" .)