Crossword Genius

Trade union official (9)

Ross

I think it could be either:

Which length description are you looking for?:

9

4,7

organiser

(Other definitions for organiser that I've seen before include "Rosie rang the person in charge of the arrangements" , "Manager" , "One in charge" , "Maker of arrangements" , "bound to keep personal data" .)

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