Two-legged animal (5)
I believe the answer is:
biped
'two-legged animal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for biped that I've seen before include "Two-legged animal" , "Eg man" , "One walking on two legs" , "One standing on two feet" , "Animal walking on two feet" .)