Crossword Genius

Senior citizen upset Mary about nothing (5)

Ross

I believe the answer is:

mayor

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

'senior citizen' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'upset mary about nothing' is the wordplay.
'upset' is an anagram indicator.
'about' means one lot of letters goes inside another.
'nothing' becomes 'O' (looks like zero - 0).
'mary' is an anagram of 'mayr'.
'mayr' going around 'o' is 'MAYOR'.

Can you help me to learn more?

(Other definitions for mayor that I've seen before include "Civic leader" , "City government head" , "Officer" , "Town's elected head" , "Town official" .)

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