Crossword Genius

Going on foot, mathematician leaves capital (8)

Ross

I believe the answer is:

enduring

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'going on' is the definition.
(enduring is a kind of going on)

I can't explain the rest of the clue.

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(Other definitions for enduring that I've seen before include "stable ..." , "Eternal" , "showing toleration" , "Lasting' tolerating" , "Putting up with patiently" .)

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