Answer: spieson

AnswerCrossword Clue
SPIESON

Surveils

SPIESON

Watches secretly

SPIESON

Wiretaps, e.g.

SPIESON
Invades one's privacy
SPIESON
Watches covertly
SPIESONObserves secretly
SPIESONObserves covertly
SPIESONKeeps under surveillance