A politician and artist going round house for a jar (7)
I believe the answer is:
amphora
'a jar' is the definition.
(amphora is a kind of jar)
'a politician and artist going round house' is the wordplay.
'politician' becomes 'mp'.
'and' is a charade indicator (letters next to each other).
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'going round' indicates putting letters inside.
'house' becomes 'ho' (abbreviation for house**).
'mp'+'ra'='mpra'
'mpra' enclosing 'ho' is 'mphora'.
'a'+'mphora'='AMPHORA'
'for' acts as a link.
(Other definitions for amphora that I've seen before include "Ancient Greek or Roman jar with two handles" , "Classical jar for storing liquids" , "Ancient jar with two handles, for wine" , "Ancient Greek storage jar" , "jar from Greece" .)