Answer:

spiers

Answer	Crossword Clue
SPIERS	Agents and moles
SPIERS	Watchers in secret.
SPIERS	Watchers.

SPIERS	Snoops
SPIERS	Peeping Toms
SPIERS	Watchful ones
SPIERS	Clandestine watchers
SPIERS	Watchers in secret
SPIERS	Good lookers?

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.