Crossword Genius

As, in the lab (7)

Ross

I believe the answer is:

arsenic

'as in the lab' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for arsenic that I've seen before include "Poison found in races" , "Poisons in scare" , "Element No 33" , "Ratsbane" , "killer" .)

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