Answer: codename

AnswerCrossword Clue
CODENAME

Deep Throat, for one

CODENAME

Spy's secret moniker

CODENAME

Alias for an agent

CODENAME
Alias for a secret agent
CODENAME
Manhattan Project, e.g.
CODENAMESpy's alias
CODENAMEFat Man or Abscam
CODENAMEBarack Obama's is "Renegade"
CODENAMEOperation Overlord, e.g.
CODENAMEAgent's cover
CODENAMEOverlord, for D-day
CODENAMESecret identity
CODENAMEA spy may use one
CODENAMEOperation Desert Fox, e.g.
CODENAMEPart of a cover
CODENAMESecret moniker