"Laughing Cavalier" artist (4)
I believe the answer is:
hals
'laughing cavalier artist' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hals that I've seen before include "Sixteenth to seventeenth century Dutch artist known for portraits" , "Laughing Cavalier artist" , "Frans --, Dutch artist" , "Frans - , Dutch painter (The Laughing Cavalier)" , "Painter of The Laughing Cavalier, d. 1666" .)