Soldiers put up notice in thoroughfare (4)
I believe the answer is:
road
'thoroughfare' is the definition.
(I've seen this before)
'soldiers put up notice' is the wordplay.
'soldiers' becomes 'or' (Other Rank).
'put up' shows that the letters should be reversed in order.
'notice' becomes 'ad' (both can mean an advertisement).
'or' reversed gives 'ro'.
'ro'+'ad'='ROAD'
'in' is the link.
(Other definitions for road that I've seen before include "See 10" , "Mine passage; way" , "Abbey -, Beatles album" , "public highway" , "course" .)