Hieronymus —, painter (5)
I believe the answer is:
bosch
I believe this clue is a double definition.
'hieronymus' is the first definition.
(15th-century artist Hieronymus Bosch)
'painter' is the second definition.
(I've seen this before)
(Other definitions for bosch that I've seen before include "Fantastic Dutch artist" , "Dutch painter of The Garden of Earthly Delights, d. 1516" , "Hieronymous -----, Dutch painter" , "Hieronymus -, fifteenth century to sixteenth century artist" , "Dutch painter known especially for "The Garden of Earthly Delights"" .)