Answer: DETECT

AnswerCrossword Clue
DETECTEmulate Magnum
DETECTFind out.
DETECTNero Wolf and Perry Mason do.
DETECTWhat private eyes do.
DETECTWhat Lupin and Dupin do.
DETECTDiscover.
DETECTEspy.
DETECTSpot: Colloq.
DETECTFind out
DETECTObserve.
DETECTEmulate Columbo
DETECTSmell out
DETECTDo some sleuthing
DETECTDescry
DETECTCatch sight of
DETECTNotice
DETECTCatch the scent of
DETECTDo a gumshoe's work
DETECTEmulate Holmes
DETECTDo a sleuth's job
detectto discover (to find out, also DISCOURE, DISCURE)
detectto discover or notice
DETECTUncover
DETECTSniff out, perhaps
DETECTAscertain
DETECTEspy
DETECTMake out
DETECTDo gumshoe's work
DETECTWhat gumshoes do
DETECTDiscover
DETECTFind out about
DETECTImitate Ellery Queen
DETECTDo a private eye's job
DETECTEmulate Ellery
DETECTFind
DETECTSense
DETECTFerret out
DETECTPick up on
DETECTSpot
DETECTDiscover, a la Sam Spade