Where some Belgians are in the money, presumably (5)

I believe the answer is:

ypres

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'where some belgians' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'in the money presumably' is the wordplay.
'in' says the answer is hidden in the clue.
'YPRES' can be found hidden inside 'money presumably'.

'are' is the link.

Can you help me to learn more?

(Other definitions for ypres that I've seen before include "WW One battle site" , "scene of battle" , "World War I battlefield" , "WW1 battle town" , "WW1 battle site" .)

I've seen this clue in the Evening Standard.

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