Clue \Clue\ (kl[=u]), n. [See Clew, n.]

A ball of thread; a thread or other means of guidance. Same as Clew.

You have wound a goodly clue. --Shak.

This clue once found unravels all the rest. --Pope.

Serve as clues to guide us into further knowledge. --Locke.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Clew \Clew\, Clue \Clue\, n. [OE. clewe, clowe, clue, AS. cleowen, cliwen, clywe ball of thread; akin to D. kluwen, OHG. chliwa, chliuwa, G. dim. kleuel, kn["a]uel, and perch. to L. gluma hull, husk, Skr. glaus sort of ball or tumor. Perch. akin to E. claw. [root]26. Cf. Knawel.]

1. A ball of thread, yarn, or cord; also, The thread itself.

Untwisting his deceitful clew. --Spenser.

2. That which guides or directs one in anything of a doubtful or intricate nature; that which gives a hint in the solution of a mystery.

The clew, without which it was perilous to enter the vast and intricate maze of countinental politics, was in his hands. --Macaulay.

3. (Naut.) (a.) A lower corner of a square sail, or the after corner of a fore-and-aft sail. (b.) A loop and thimbles at the corner of a sail. (c.) A combination of lines or nettles by which a hammock is suspended.

Clew garnet (Naut.), one of the ropes by which the clews of the courses of square-rigged vessels are drawn up to the lower yards.

Clew line (Naut.), a rope by which a clew of one of the smaller square sails, as topsail, topgallant sail, or royal, is run up to its yard.

Clew-line block (Naut.), The block through which a clew line reeves. See Illust. of Block.

Source: Webster's Revised Unabridged Dictionary (1913)