Orangutans and gorillas (4)
I believe the answer is:
apes
'orangutans and gorillas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for apes that I've seen before include "Imitates in every aspect" , "Parrots" , "Species of primate" , "Copies the primates?" , "Peas (anag)" .)