Answer: SPYON

AnswerCrossword Clue
SPYONSurveil
SPYONBug, say
SPYONView slyly
SPYONShadow, e.g.
SPYONObserve secretly
SPYONWatch through binoculars, say
SPYONWatch slyly
SPYONObserve furtively
SPYONWatch secretly.
SPYONTail, maybe
SPYONSecretly observe
SPYONTail, perhaps
SPYONWatch in secret
SPYONWatch furtively
SPYONBug
SPYONTrack, as the feds might do to a suspect
SPYONObserve covertly
SPYONInvestigate, perhaps
SPYONKeep under surveillance
SPYONFollow
SPYONObserve surreptitiously
SPYONWatch through a keyhole
SPYONObserve through a keyhole
SPYONWatch from hiding
SPYONWatch surreptitiously
SPYONWatch from the trees, say
SPYONWatch, secret agent-style
SPYONSecretly watch
SPYONWatch covertly
SPYONWatch secretly