Male wearing fancy leotard's an artist (3,6)
I believe the answer is:
old master
'an artist' is the definition.
(old master is a kind of artist)
'male wearing fancy leotard's' is the wordplay.
'male' becomes 'm' (common abbreviation).
'wearing' means one lot of letters goes inside another.
'fancy' is an anagram indicator.
'leotards' with letters rearranged gives 'oldaster'.
'm' going within 'oldaster' is 'OLD MASTER'.
(Other definitions for old master that I've seen before include "A great European painter - a painting by one" , "soon to leave school?" , "special picture" , "scholar with greybeard" , "Great painter of former times - or one of his works" .)