Trip around the track (3)
I believe the answer is:
lap
'trip around the track' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lap that I've seen before include "One round of the track" , "Drink (like dog), circuit" , "Use tongue to drink; circuit" , "One circuit of track" , "Track circuit; drink" .)