Crossword Genius

A fellow joining sizeable event (6)

Ross

I believe the answer is:

affair

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'event' is the definition.
(affair is a kind of event)

'a fellow joining sizeable' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'joining' is a charade indicator (letters next to each other).
'sizeable' becomes 'fair' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'f'+'fair'='AFFAIR'

Can you help me to learn more?

(Other definitions for affair that I've seen before include "Romantic relationship between two unmarried people", "Business; romance", "Secret sexual relationship", "A function or a romance", "Liaison or intrigue".)

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