The ____ Rock is roughly the halfway point in a race currently from Cowes to Cherbourg (7)

I believe the answer is:

fastnet

(Other definitions for fastnet that I've seen before include "area next to Lundy" , "Rock off Co. Cork" , "shipping forecast area" , "A sea area; a yacht race" .)

I've seen this clue in The Times and The Sunday Times.

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