Walking pace (4)
I believe the answer is:
step
This clue could be a double definition.
'walking' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'pace' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for step that I've seen before include "Stride" , "Single pace" , "Pace - part of a procedure" , "little walk?" , "Measure taken" .)