Local dignitary stupidly alarmed any number (8)

I believe the answer is:

alderman

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'local dignitary' is the definition.
'alderman' can be an answer for 'dignitary' (I've seen this before). I am not sure about the 'local' bit.

'stupidly alarmed any number' is the wordplay.
'stupidly' indicates an anagram (a stupid ordering of the letters).
'any number' becomes 'n' (mathematical symbol for an unspecified number).
'alarmed' with letters rearranged gives 'alderma'.
'alderma'+'n'='ALDERMAN'

Can you help me to learn more?

(Other definitions for alderman that I've seen before include "Member of an English city council" , "Member of English county council" , "Civic officer" , "Former civic dignitary" , "Member of a local legislative body" .)

I've seen this clue in The Sun.

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