An older, funny old artist (8)
I believe the answer is:
leonardo
'artist' is the definition.
(Leonardo is an example)
'an older funny old' is the wordplay.
'funny' indicates anagramming the letters.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'an'+'older'='anolder'
'anolder' anagrammed gives 'leonard'.
'leonard'+'o'='LEONARDO'
(Other definitions for leonardo that I've seen before include "-- di Caprio, actor" , "and 12 Across: Renaissance genius" , ". . . . . . . . da Vinci (Renaissance genius)" , "Da Vinci and Di Caprio" , "US actor, - DiCaprio" .)