Answer:

OPERATIVE

Answer	Crossword Clue
OPERATIVE	Spy
OPERATIVE	Undercover agent
OPERATIVE	Functioning effectively

OPERATIVE	Agent
OPERATIVE	FBI agent.
OPERATIVE	Garment worker or detective.
OPERATIVE	Agent.
OPERATIVE	Detective.
OPERATIVE	Agent or artisan.
OPERATIVE	Working
OPERATIVE	Secret agent

OPERATIVE	Private eye
OPERATIVE	In working order
OPERATIVE	Sleuth
OPERATIVE	Key
OPERATIVE	Private detective

Crossword

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