A deputy was a title used as a profession or a legal term.
Security
Odo had a security team of deputies. (DS9 episode: "Emissary", etc.)
Odo thought some of his deputies would make reasonable constables, his own position. (DS9 - Rebels novel: The Conquered)
Odo spoke particularly highly of one of his deputies, Sergeant Shul Torem. (DS9 - S31 novel: Abyss)
