What walkers did when they set foot in the Kentish area (6)
I believe the answer is:
strode
'what walkers did when they' is the definition.
The definition suggests an adverb but the answer is not.
'set foot in the kentish area' is the wordplay.
'set foot' becomes 'trod' (to tread somewhere is to set foot there).
'in the' indicates putting letters inside.
'kentish area' becomes 'se' (I can't explain this - if you can you should give a lot more credence to this answer).
'trod' put inside 'se' is 'STRODE'.
Can you help me to learn more?
(Other definitions for strode that I've seen before include "Walked fast with long steps" , "went on foot" , "Paced" , "Galumphed" .)