Answer: spiers

AnswerCrossword Clue
SPIERSAgents and moles
SPIERSWatchers in secret.
SPIERSWatchers.
SPIERSSnoops
SPIERSPeeping Toms
SPIERSWatchful ones
SPIERSClandestine watchers
SPIERSWatchers in secret
SPIERSGood lookers?
spiersSPIER, to inquire, also SPEER, SPEIR
spiersperson who spies, watches, or discovers