Part of Apache America in Greater London (5)

I believe the answer is:

cheam

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

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

'part of apache america in' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'CHEAM' can be found hidden inside 'apache america in'.

Can you help me to learn more?

(Another definition for cheam that I've seen is " London suburb".)

I've seen this clue in the Evening Standard.

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