Painter of many unconventional ages (5)
I believe the answer is:
degas
'painter' is the definition.
(Edgar Degas, 1834-1917)
'many unconventional ages' is the wordplay.
'many' becomes 'D' (Roman numeral for 500).
'unconventional' indicates anagramming the letters.
'ages' is an anagram of 'egas'.
'd'+'egas'='DEGAS'
'of' acts as a link.
(Other definitions for degas that I've seen before include "Edgar -, c. Nineteen-twenty Fr. painter" , "French painter of ballet girls etc" , "French artist known for his ballet scenes, d.1917" , "He produced works of art" , "Edgar -, French impressionist" .)