Race finish in London (4,3)

'london' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'race finish' is the wordplay.
I cannot quite understand how this works, but
'race' could be 'mile' and 'mile' is present in the answer.
'finish' could be 'end' ('end' can be a synonym of 'finish') and 'end' is located in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?