Artist, for instance, in sad disarray (5)
I believe the answer is:
degas
'artist' is the definition.
(Edgar Degas, 1834-1917)
'for instance in sad disarray' is the wordplay.
'for instance' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'in' means one lot of letters goes inside another.
'disarray' indicates an anagram.
'sad' is an anagram of 'das'.
'eg' put within 'das' is 'DEGAS'.
(Other definitions for degas that I've seen before include "Edgar -, Fr. artist" , "French impressionist painter, d. 1917" , "He produced works of art" , "French artist known for his ballet scenes, d.1917" , "Edgar -, Fr. sculptor/ painter" .)