Where a foot race finished in east London (4,3)

I believe the answer is:

mile end

I'm a little stuck... Click here to teach me more about this clue!

'east london' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'where a foot race finished' is the wordplay.
I cannot really understand how this works, but
'race' could be 'mile' and 'mile' is found within the answer.
'finished' could be 'end' (I've seen this before) and 'end' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?

(Another definition for mile end that I've seen is " 6D 5A [TUBE STATION]".)

I've seen this clue in the Evening Standard.

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