Uneven walk (4)
I believe the answer is:
limp
'uneven walk' is the definition.
(to limp is to walk unevenly)
This is the entire clue.
(Other definitions for limp that I've seen before include "Walk with uneven gait" , "obstacle to smooth progress" , "Walk with an uneven stop" , "Lacking stiffness" , "Walk stiffly - lacking energy" .)