The phrase "a possible spy" is correct and usable in written English.
You can use it when discussing someone who may be suspected of espionage or covert activities, but without certainty.
Example: "The authorities are investigating a possible spy within the organization who may have leaked sensitive information."
Alternatives: "a potential spy" or "a suspected spy."
There is a long history of regarding John Dee as a possible spy (Letters, 21 January).
And yet... it still took years to identify Mr. Hanssen as a possible spy.
During the McCarthy era, Ms. Hinton's name surfaced as a possible spy and spiller of nuclear secrets after she spoke at a peace conference in Beijing.
The A.P. quoted a Taliban-friendly local news agency, the Afghan Islamic Press, as saying Ms. Ridley was being investigated as a possible spy.
She said she told Mr. Adkins, who is now retired from the military, about the meeting and noted at the time that she believed Private Manning was a possible spy.
By most accounts, Mr. Chan is a former soldier, a possible spy, a pilot and a party member with what were thought to be impeccable connections with the government and its shadowy Ministry of State Security.
The writer travelled to Germany in 1978 as a scholar and lived there for several years, during which time the German State Security Service, or Stasi, kept a file on him as a possible spy--a file which included regular reports from informants that the writer considered friends.
Didier Deschamps has expressed concerns that France's preparations for Sunday's opening game against Honduras have been compromised by a possible spying mission after a drone hovered over their training camp in Brazil.
Privately, however, military officials voice deeper concerns about the scope of any possible spy penetration at the prison camp, and the ultimate goal of any conspiracy.
Remember to un-zoom and look around to see if any possible Spies lurking around or Snipers aiming at you from another direction.
If you suspect that someone you know might be a spy, check for possible "spy signs".
