Complete with painting, rushed in (6)
I believe the answer is:
arrant
'complete' is the definition.
(old-fashioned term meaning complete or utter)
'painting rushed in' is the wordplay.
'painting' becomes 'art' (painting is an art).
'rushed' becomes 'ran'.
'in' means one lot of letters goes inside another.
'art' going around 'ran' is 'ARRANT'.
'with' acts as a link.
(Other definitions for arrant that I've seen before include "Downright, out and out like nonsense" , "Out-and-out, notorious" , "Utter and absolute, maybe nonsense" , "Downright - maybe nonsense" , "Blatant" .)