Conservative works in Barrow (4)
I believe the answer is:
cart
'barrow' is the definition.
(thesaurus)
'conservative works' is the wordplay.
'conservative' becomes 'C' (UK political abbreviation).
'works' becomes 'art' (I've seen this before).
'c'+'art'='CART'
'in' acts as a link.
(Other definitions for cart that I've seen before include "Two-wheeled, drawn vehicle" , "Two-wheeled open wagon" , "Light vehicle" , "Open vehicle" , "Old two-wheeled goods vehicle" .)