Stick round a thoroughfare (4)
I believe the answer is:
road
'thoroughfare' is the definition.
(a thoroughfare is a type of road)
'stick round a' is the wordplay.
'stick' becomes 'rod' (I've seen this before).
'round' is an insertion indicator.
'rod' going around 'a' is 'ROAD'.
(Other definitions for road that I've seen before include "motorway?" , "Highway or byway" , "For place to anchor" , "Thoroughfare" , "course" .)