Crossword Genius

The alternative in France is grave (5)

Ross

I believe the answer is:

acute

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'is grave' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for acute that I've seen before include "Sharp - sort of French accent" , "quick on the uptake" , "Grave" , "Incisive" , "Keen; severe" .)

I've seen this clue in The Globe and Mail.
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