Painter entered secretly (2,6)
I believe the answer is:
in camera
'secretly' is the definition.
(I've seen this before)
'painter entered' is the wordplay.
I cannot quite see how this works, but
'painter' could be 'ra' (member of the Royal Academy of Arts) and 'ra' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for in camera that I've seen before include "Privately - American (anag)" , "Conducted in private" , "Film would get put here" , "avoiding press and public" , "not shown to the public?" .)