Unattractive artist's brief from Greta Thunberg? (2,3,8)
I believe the answer is:
no oil painting
'unattractive' is the definition.
(I've seen this before)
'artist's brief from greta thunberg?' is the wordplay.
I cannot really understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for no oil painting that I've seen before include "description of watercolour?" , "rather unattractive" , "Portrait in water colours" , "that's inferior on the face of it" , "plain" .)