Convoy a Republican's taken through Irish county (7)
I believe the answer is:
caravan
'convoy' is the definition.
(I've seen this before)
'a republican's taken through irish county' is the wordplay.
'republican' becomes 'r' (abbreviation).
'taken through' is an insertion indicator.
'irish county' becomes 'cavan'.
'a'+'r'='ar'
'ar' going into 'cavan' is 'CARAVAN'.
(Other definitions for caravan that I've seen before include "Group of desert voyagers" , "Trailer with living quarters" , "Towable home" , "Mobile home" , "Group crossing a desert" .)