I'm in the reserves for 'City' (5)

I believe the answer is:

reims

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'city' is the definition.
(I've seen this before)

'i'm in the reserves' is the wordplay.
'in' indicates putting letters inside.
'the reserves' becomes 'res' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'im' inserted inside 'res' is 'REIMS'.

'for' is the link.

Can you help me to learn more?

(Other definitions for reims that I've seen before include "Champagne capital (variant spelling)" , "City of northeast France" , "City, the traditional site for crowning French kings" , "city in NE France" .)

I've seen this clue in the Evening Standard.

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