Crossword Genius

Element involved in scare (7)

Ross

I believe the answer is:

arsenic

'element' is the definition.
(I know that arsenic is a metalloid)

'involved in scare' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'in'+'scare'='inscare'
'inscare' with letters rearranged gives 'ARSENIC'.

(Other definitions for arsenic that I've seen before include "Element with many poisonous compounds" , "killer" , "Poison used in pesticides and weedkillers" , "Toxic metallic element used as rat poison" , ", it goes with old lace" .)

I've seen this clue in The Daily Express.
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