It's not often artist goes to bank (6)
I believe the answer is:
rarely
'it's not often' is the definition.
('rarely' is the opposite to 'often')
'artist goes to bank' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'goes to' says to put letters next to each other.
'bank' becomes 'rely' (I've seen this before).
'ra'+'rely'='RARELY'
(Other definitions for rarely that I've seen before include "Not done or occurring very often" , "Not very often, seldom in fact" , "once in a blue moon" , "Seldom, not frequently" , "when hundred-to-one horse wins?" .)