Bird he introduced to artist (4)
I believe the answer is:
rhea
'bird' is the definition.
(I know that rhea is a type of flightless bird)
'he introduced to artist' is the wordplay.
'introduced to' indicates putting letters inside.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'he' put within 'ra' is 'RHEA'.
(Other definitions for rhea that I've seen before include "South American flightless bird - mother of Zeus" , "Greek goddess of fertility - running bird" , "Flightless bird from South America" , "Flightless bird -- satellite of Saturn" , "Large S. American bird" .)