Chimp or orangutan (3)
I believe the answer is:
ape
This clue is a double definition.
'chimp' is the first definition.
(chimpanzees are apes)
'orangutan' is the second definition.
(orangutans are apes)
(Other definitions for ape that I've seen before include "Large primate" , "Take off" , "Mimic the primate" , "Copy - primate" , "Imitate like primate" .)