Actress Perlman of "Cheers" (4)
I believe the answer is:
rhea
'actress perlman of cheers' 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 "It can't fly" , "Small 'ostrich'" , "Fast runner" , "Ostrich-like bird of South America" , "Big bird" .)