Actress Perlman (4)
I believe the answer is:
rhea
'actress perlman' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rhea that I've seen before include "New World flightless bird" , "Large S. American bird" , "S American runner" , "Titaness" , "S. Amer. flightless bird" .)