anything that serves to guide or direct in the solution of a problem, mystery, etc.
clew ( defs 1–4, 6, 12 ).
verb (used with object), clued, cluing.
to direct or point out by a clue.
clew ( def 7 ).
Verb phrases
clue in,
to provide with useful or reliable information: Clue us in on how these forms are to be filled out.
to make familiar or aware: Has she been clued in about the rules of this office?

variant spelling of clew

1. sign, hint, trace, evidence, mark, key. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clue (kluː)
1.  something that helps to solve a problem or unravel a mystery
2.  not to have a clue
 a.  to be completely baffled
 b.  to be completely ignorant or incompetent
vb , clues, cluing, clued
3.  (tr; usually foll by in or up) to provide with helpful information
n, —vb
4.  a variant spelling of clew
[C15: variant of clew]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

phonetic variant of clew (q.v.) "a ball of thread or yarn," with reference to the one Theseus used as a guide out of the Labyrinth. The purely figurative sense of "that which points the way" is from 1620s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Maybe they will even get a hint of a clue about security.
Another way to clue an entry in cryptic crosswords is to call for an anagram of
  part of the clue itself.
They distract us mid-conversation and make us miss the critical clue in the
  mystery we're watching at the theater.
Much to his surprise, the shop-floor grunts often have no clue who he is.
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