Crossword clue: watch, observe, or inquire secretly
4 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
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a detective who follows a trailAnother word for spyThe track of man or beast as followed by the scent. Halliwell.a spy who makes uninvited inquiries into the private affairs of others(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors