Ape kangaroos (3)
I believe the answer is:
hop
'ape kangaroos' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hop that I've seen before include "'..., step and jump (3)'" , "Climbing plant used to flavour beer (3)" , "Informal dance" , "Jump lightly" , "Leap on one leg" .)