Feasible to pay for travelling most cheaply? (2,4)
I believe the answer is:
on foot
'cheaply?' is the definition.
Both the answer and definition are adverbs. Perhaps you can see an association between them that I don't see?
'feasible to pay for travelling most' is the wordplay.
I cannot quite understand how this works, but
'feasible' could be 'on' (as opposed to 'not on' -unacceptable or unfeasible) and 'on' is present in the answer.
'pay' could be 'foot' (as in footing the bill) and 'foot' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for on foot that I've seen before include "Going as pedestrian" , "By shanks's pony" , "where the corn's growing?" , "Walking or running" .)