tipster

[tip-ster]
noun
a person who makes a business of furnishing tips, as for betting or speculation.

Origin:
1860–65; tip3 + -ster

tipper, tipster.
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World English Dictionary
tipster (ˈtɪpstə)
 
n
a person who sells tips on horse racing, the stock market, etc

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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Example sentences
And whatever the traffickers were building, the tipster had warned, was truly
  enormous.
He was a racing tipster and a professional character.
The tipster and the tipster's phone number remain anonymous to law enforcement
  unless the tipster chooses to identify themselves.
Tipster calls back, advise the tipster of the amount of the cash award and
  explain the process for obtaining it.
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