Single step or stride (4)
I believe the answer is:
pace
I believe this clue is a double definition.
'single step' is the first definition.
(I've seen this in another clue)
'stride' is the second definition.
(I know that stride can be written as pace)
(Other definitions for pace that I've seen before include "Stride" , "Lick" , "Speed of a single step?" , "politely expressing disagreement" , "With due respect" .)