Crossword Genius

Senior citizen upsets 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?

'upsets mary about nothing' is the wordplay.
'upsets' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'nothing' becomes 'O' (looks like zero - 0).
'mary' with letters rearranged gives 'mayr'.
'mayr' going around 'o' is 'MAYOR'.

Can you help me to learn more?

(Other definitions for mayor that I've seen before include "Town chief" , "Civic head of town or borough" , "Officer" , "Corporation head" , "First citizen of a city" .)

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