Walk back from the Capitol (4)
I believe the answer is:
pace
'walk' is the definition.
(pacing is a kind of walking)
'back from the capitol' is the wordplay.
'back' is a reversal indicator.
'from' says the answer is hidden in the clue.
'ecap' can be found hidden inside 'the capitol'.
'ecap' written backwards gives 'PACE'.
(Other definitions for pace that I've seen before include "speed of movement" , "Tempo, rate of moving" , "Speed of a single step?" , "Gait" , "Clip" .)