Crossword Genius

Wipers, as Tommy once whimsically said (5)

Ross

I believe the answer is:

ypres

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I'm afraid I can't even guess how this answer relates to the clue.

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

I've seen this clue in the Evening Standard.
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