Undercover Agent Crossword Clue — 3 Letters

One confident answer with explanation of the wordplay

SPY
Best match
S
P
Y

An "undercover agent" is commonly called a SPY — a 3-letter word that is a classic crossword answer for this clue.

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Other possible answers
NARInformal term for an undercover narcotics agent (narc), sometimes shortened to NAR.
MOLLess likely, but 'mole' refers to an undercover agent embedded in an organization.
COPA stretch, but an undercover cop is a type of undercover agent.

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