Belgian part of Hungary, presumably (5)

I believe the answer is:

ypres

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'belgian part' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'of hungary presumably' is the wordplay.
'of' indicates a hidden word.
'YPRES' is hidden in the letters of 'hungary presumably'.

Can you help me to learn more?

(Other definitions for ypres that I've seen before include "WWI battlefield" , "WW1 battle town" , "World War I battleground" , "Scene of action" , "World War I battlefield" .)

I've seen this clue in the Evening Standard.

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