Prince Harry's portrait painter (4)
I believe the answer is:
hals
'portrait painter' is the definition.
(I've seen this before)
'prince harry's' is the wordplay.
'prince' becomes 'hal' (I've seen this before).
'harry's' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'hal'+'s'='HALS'
Can you help me to learn more?
(Other definitions for hals that I've seen before include "Frans --, Dutch artist" , "Sixteenth to seventeenth century Dutch artist known for portraits" , "Laughing Cavalier artist" , "Frans - , Dutch painter (The Laughing Cavalier)" , "Painter of The Laughing Cavalier, d. 1666" .)