Poison scare in new development (7)

I believe the answer is:

arsenic

I'm a little stuck... Click here to teach me more about this clue!

'poison' is the definition.
(I've seen this before)

'scare in new development' is the wordplay.
'scare in' can be anagrammed to 'ARSENIC'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for arsenic that I've seen before include "-- and Old Lace (play)" , "Ratsbane" , "Poison found in races" , "Toxic metalloid element" , "Poison used in pesticides and weedkillers" .)

I've seen this clue in The Telegraph, The Globe and Mail and The Guardian.

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