Mount pictures a painter’s put in (6)
I believe the answer is:
ararat
'mount' is the definition.
(I've seen this before)
'pictures a painter's put in' is the wordplay.
'pictures' becomes 'art'.
'painter' becomes 'RA' (member of the Royal Academy of Arts).
'put in' is an insertion indicator.
'a'+'ra'='ara'
'art' enclosing 'ara' is 'ARARAT'.
(Other definitions for ararat that I've seen before include "Supposed resting place of Noah's ark" , "Noah's ark mountain" , "Volcanic mount in eastern Turkey" , "Highest mountain in Turkey" , "Noah's Ark is reputed to lie on this Mount" .)