Part of a sheet typifying English painter (4*)
I believe the answer is:
'english painter' is the definition.
(I've seen this before)
'part of a sheet typifying' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'ETTY' is hidden within 'a sheet typifying'.
(Other definitions for etty that I've seen before include "British artist, 1787-1849", "English artist", "painter of the nude", "British painter", "English painter, William (1787-1849)".)