Answer:

gumshoe

Answer	Crossword Clue
GUMSHOE	Dick
GUMSHOE	Sam Spade, e.g., slangily
GUMSHOE	Sleuth, informally

GUMSHOE	Mike Hammer, for example, in slang
GUMSHOE	Follower of a cold case, perhaps
GUMSHOE	Detective
GUMSHOE	Private eye
GUMSHOE	Case worker?
GUMSHOE	Detective: Slang.
GUMSHOE	Sleuth: Slang.
GUMSHOE	Private eye.

GUMSHOE	Relative of a dick.
GUMSHOE	Sneaker
GUMSHOE	One who may be on your case
GUMSHOE	Sleuth, in slang
GUMSHOE	Tec
GUMSHOE	Shamus