Leading exponent of drag, the outlandish (9)
I believe the answer is:
godfather
'leading exponent' is the definition.
(I've seen this before)
'of drag the outlandish' is the wordplay.
'outlandish' indicates anagramming the letters.
'of'+'drag'+'the'='ofdragthe'
'ofdragthe' is an anagram of 'GODFATHER'.
(Other definitions for godfather that I've seen before include "gang boss" , "Religious relation, like Marlon Brando in movie" , "Mafia chief or spiritual parent" , "leading exponent" , "He's a sponsor at Baptism" .)