Dutch portraitist (4)
I believe the answer is:
hals
'dutch portraitist' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hals that I've seen before include "portrait painter" , "Frans --, Dutch artist" , "Frans - , Dutch painter (The Laughing Cavalier)" , "Royal portraitist" , "Painter of The Laughing Cavalier, d. 1666" .)