Answer: tec

AnswerCrossword Clue
TECInvestigator, informally
TECInvestigator, slangily
TECPrivate eye, slangily
TECSherlock
TECGumshoe, for short
TECPI
TECHammer or Spade, e.g.
TECGumshoe, briefly
TECCriminal investigator, for short
TECPrivate eye, for short
TECSleuth, to Sayers
TECNoir hero
TECWhodunit solver, briefly
TECHawkshaw
TECNoir protagonist
TECSam Spade type
TECSleuth, slangily
TECSam Spade, e.g.
TECColumbo, for one
TECEye
tecdetective
TECInvestigator, briefly
TECDick
TECGumshoe
TECShamus
TECSleuth
TECPrivate eye
TECOld-time gumshoe
TECSleuth, briefly
TECPhilip Marlowe type, informally
TECMagnum, for one
TECP.I.
TECHammer, e.g., briefly
TECHi-..: shoe brand
TECMagnum, e.g., briefly
TECSpade, e.g., briefly
TECSpade, e.g., slangily
TECDick Tracy is one, briefly
TECV.I. Warshawski, e.g.
TECPrivate eye, briefly