Crossword Genius

Reduce the area of a sail exposed to the wind (4)

Ross

I believe the answer is:

reef

(Other definitions for reef that I've seen before include "Ridge of rock or sand just below sea surface" , "Ridge of rock just under water" , "bar" , "Shallow coral ridge" , "Ridge of coral near the sea surface" .)

I've seen this clue in The Guardian.
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