Answer:

tec

Answer	Crossword Clue
TEC	P.I.
TEC	Dick
TEC	Gumshoe

TEC	Shamus
TEC	Sleuth
TEC	Private eye
TEC	Old-time gumshoe
TEC	Sleuth, briefly
TEC	Philip Marlowe type, informally
TEC	Magnum, for one
TEC	Investigator, briefly

TEC	Hammer, e.g., briefly
TEC	Hi-..: shoe brand
TEC	Magnum, e.g., briefly
TEC	Spade, e.g., briefly
TEC	Spade, e.g., slangily
TEC	Dick Tracy is one, briefly
TEC	V.I. Warshawski, e.g.
TEC	Private eye, briefly

TEC	Hammett's Spade, e.g.
TEC	Noir hero
TEC	Investigator, slangily
TEC	Private eye, slangily
TEC	Sherlock
TEC	Gumshoe, for short
TEC	PI
TEC	Hammer or Spade, e.g.

TEC	Gumshoe, briefly
TEC	Criminal investigator, for short
TEC	Private eye, for short
TEC	Sleuth, to Sayers
TEC	Investigator, informally
TEC	Whodunit solver, briefly
TEC	Hawkshaw
TEC	Noir protagonist

TEC	Sam Spade type
TEC	Sleuth, slangily
TEC	Sam Spade, e.g.
TEC	Columbo, for one
TEC	Eye