Sentence:  "Run aft, Haldane, and you too, Spokeshave. Loosen the bunt of the mizzen-trysail and haul at the <WSD>clew</WSD>. That'll bring her up to the wind fast enough, if the sail only stands it!" 
Meaning of the word marked with <WSD> tags:  The lower corner(s) of a sail to which a sheet is attached for trimming the sail (adjusting its position relative to the wind); the metal loop or cringle in the corner of the sail, to which the sheet is attached.  The trailing corner relative to the wind direction.