Source : Webster's Revised Unabridged Dictionary (1913)

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.

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 : WordNet®

clue
     n 1: a slight indication [syn: {hint}]
     2: evidence that helps to solve a problem [syn: {clew}, {cue}]
     v : roll into a ball [syn: {clew}]