In an Irish county, an artist has a mobile home (7)
I believe the answer is:
caravan
'a mobile home' is the definition.
(caravan is a kind of mobile home)
'in an irish county an artist' is the wordplay.
'in' indicates putting letters inside.
'an irish county' becomes 'cavan'.
'an artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'cavan' placed around 'ra' is 'CARAVAN'.
'has' acts as a link.
(Other definitions for caravan that I've seen before include "Group of desert travellers" , "Camel train" , "Desert convoy" , "Towed vehicle" , "Mobile home" .)