Crossword Genius

Wind-powered ship's chief means of propulsion (8)

Ross

I believe the answer is:

mainsail

(Other definitions for mainsail that I've seen before include "key equipment on board" , "Ian's mail (anagram)" , "The principal sheet on board" , "Ship's largest canvas" , "Lowest canvas on the principle mast" .)

I've seen this clue in The Times.
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