Walking (2,4)

There are a few possibilities for this:

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6 2,3

2,4

5* 10*

on foot

'walking' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for on foot that I've seen before include "where the corn's growing?" , "Walking or running" , "Going as pedestrian" , "By shanks's pony" .)

I've seen this clue in The Guardian and The Telegraph.

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