Artist in Bern studio (5)
I believe the answer is:
ernst
'artist' is the definition.
(max ernst)
'in bern studio' is the wordplay.
'in' indicates a hidden word.
'ERNST' is hidden within 'bern studio'.
(Other definitions for ernst that I've seen before include "Young partner" , "German-born painter, Max, co-founder of dadaism, d. 1976" , "artist's name" , "Max -, twentieth century German Surrealist artist" , "He painted" .)