Oversupply in an artist’s atelier (4)
I believe the answer is:
sate
'oversupply' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.
'in an artist's atelier' is the wordplay.
'in' indicates a hidden word.
'SATE' is hidden within 'artists atelier'.
(Other definitions for sate that I've seen before include "Supply to excess" , "Quench" , "Fill completely" , "Fulfil to excess" , "Fill to satisfaction" .)