He has a part in Pygmalion (3)
I believe the answer is:
ali
'he' is the definition.
'a part in pygmalion' is the wordplay.
'a part in' indicates a hidden word.
'ALI' is hidden in the letters of 'pygmalion'.
'has' is the link.
(Other definitions for ali that I've seen before include "Muhammad ..., famous boxer" , "Muhammad or Baba?" , "Egyptian name" , "A champ'" , "Ringmaster" .)