secret agent

an agent of a secret service.
(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.

1830–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To secret agent
World English Dictionary
secret agent
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
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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