Crossword Genius

French cross-country runner (4)

Ross

I believe the answer is:

oise

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'french cross-country runner' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for oise that I've seen before include "part of France" , "French department" .)

I've seen this clue in the Evening Standard.
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