secret agent

noun
1.
an agent of a secret service.
2.
(loosely) a person employed to collect the military secrets of one country and relay them to another, especially a person living in a foreign country while so working for his or her own nation; spy.

Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To secret agent
Collins
World English Dictionary
secret agent
 
n
a person employed in espionage

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
That's why it's best to make sure your secret agent gear is top quality and
  working properly.
But if you were a secret agent working undercover, you would be extra careful
  too.
Behind every secret agent is an expert in acquiring high tech gadgetry.
The traditional peacetime source is the human secret agent.
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