Answer: arsenic

AnswerCrossword Clue
ARSENICElement forming poisonous compounds
ARSENICOne of the metalloids
ARSENICAs, chemically
ARSENICIt's detected by the Marsh test, in forensics
ARSENICPoison in classic mysteries
ARSENICCause of Philip Boyes's death in a Dorothy Sayers novel
ARSENICElderberry wine additive, in a Kesselring play
ARSENICChristie element
ARSENICPartner of Old Lace
ARSENICOnce-common pesticide component
ARSENIC"Old Lace" accompaniment
ARSENICMystery-story poison
ARSENICElement in many a whodunit.
ARSENICElement.
ARSENICAn element.
ARSENICPharmacopoeia item.
ARSENICSubject of a Lindsay-Crouse play.
ARSENICElderberry wine additive, in a classic film
arsenicgrayish white element forming poisonous compounds
ARSENICElement of many whodunits
ARSENICIngredient of the Brewster sisters' elderberry wine
ARSENICElement in many Agatha Christie books
ARSENICAs, on a table
ARSENICPoison used in a play and film
ARSENICElement of many murder mysteries?
ARSENICPoisonous atomic number 33
ARSENICCompanion of "Old Lace."
ARSENICRat poison poison
ARSENICStuff in rat poison
ARSENICOld Lace's partner
ARSENICWhat gets As in chemistry?
ARSENIC"... and Old Lace" (play and movie)
ARSENICSuspected cause of Napoleon's death
ARSENICStraight As in chemistry?
ARSENIC"... and Old Lace"
ARSENICAs, on the periodic table
ARSENICMurder mystery element?
ARSENICLethal additive to elderberry wine, in a Kesselring black comedy
ARSENICPoison in some mysteries
ARSENICPoisonous element that flavors a sauce in "You're a Mean One, Mr. Grinch"