Synonym: evidence, hint, key, lead, proof, sign. Similar words: value, a blue moon, influential, include, cluster, exclude, conclude, including. Meaning: [kluː] 
n. 1. a slight indication 2. evidence that helps to solve a problem. v. roll into a ball.
n. 1. a slight indication 2. evidence that helps to solve a problem. v. roll into a ball. 
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1, Singularity is almost invariably a clue. The more featureless and commonplace a crime is, the more difficult is it to bring it home. 
2, Police have found a vital clue .
3, I don't have a clue.
4, The police found no clue to her whereabouts.
5, I haven't got a clue.
6, I hadn't a clue to the meaning of "activism"
7, The only clue to the identity of the murderer was a half-smoked cigarette.
8, The police haven't got a clear clue up to now.
9, Geneticists in Canada have discovered a clue to the puzzle of why our cells get old and die.
10, There is no clue to the identity of the thief.
11, I have no clue.
12, He happened on a clue to the mystery.
13, I don't have a clue where she lives.
14, Please clue us to what happened.
15, I haven't a clue how to talk to girls.
16, That was the clue which clinched it for us.
17, He had found the clue to unlock the whole mystery.
18, We now have an important clue as to the time of the murder.
19, I haven't a clue what I'll give Carl for his birthday next year.
20, He searched her face for some clue as to what she meant.
21, The police found a clue which will help them catch the robber.
22, This gave me a clue as to the source of the problem.
23, The vital clue to the killer's identity was his nickname(sentencedict.com),(http://sentencedict.com/clue.html) Peanuts.
24, The police found a vital clue to the girl's disappearance in a wooded area near her home.
25, How a man shaves may be a telling clue to his age.
26, I gave him another clue, but he still didn't twig .
27, She's parked an enormous pile of papers on my desk and I haven't a clue what to do with them.
28, Don't ask your father which key to press - he hasn't got a clue about computers.
29, He speaks so indistinctly that many listeners haven't a clue what he is saying.
30, Have you an appointment? Some expressions with have are common even in informal language:I'm sorry, I haven't a clue.
More similar words: value, a blue moon, influential, include, cluster, exclude, conclude, including, exclusive, excluding, conclusion, exclusively.