Crossword Genius

It was bound to go on foot in Ancient Greece (6)

Ross

I believe the answer is:

sandal

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'it was bound' is the definition.
The definition suggests a singular noun which matches the answer.

'go on foot in ancient greece' is the wordplay.
I cannot quite understand how this works, but
'go on' could be 'and' (I've seen this in another clue) and 'and' is found in the answer.
The remaining letters 'sal' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

(Other definitions for sandal that I've seen before include "Openwork shoe" , "Light open-toed shoe" , "One can go on foot" , "Wood" , "what may be afoot" .)

I've seen this clue in The Globe and Mail.
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