Guardian to different ceremony (10)

I believe the answer is:

graduation

'ceremony' is the definition.
(I know that graduation is a type of exercise)

'guardian to different' is the wordplay.
'different' indicates anagramming the letters.
'guardian'+'to'='guardianto'
'guardianto' is an anagram of 'GRADUATION'.

(Another definition for graduation that I've seen is " Successful completion of study".)

I've seen this clue in the Sydney Morning Herald.

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