Two-footed creature (5)
I believe the answer is:
biped
'two-footed creature' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for biped that I've seen before include "Two-legged animal" , "Two-legged creature" , "Primate, for example" , "Girl, say" , "Creature with two feet" .)