Furrow made by wheels (3)
I believe the answer is:
rut
'furrow made by wheels' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rut that I've seen before include "Track made by wheels" , "Undeviating routine" , "Furrow left by wheel" , "deer find it exciting" , "Settled routine" .)