Crossword clue: a large, strong rope, reaching from the foremast head to the bowsprit, to support the mast. see illust. under ship.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
an adjustable stay from the foremast to the deck or bowsprit; controls the bending of the mast