Crossword Genius

More hostile French here before the Queen (5)

Ross

I believe the answer is:

icier

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But I can't explain it at all! Could you help me understand?

(Other definitions for icier that I've seen before include "comparatively aloof" , "More slippery" , "More treacherous" , "Colder even than 31 Across" , "rather cold" .)

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