Crossword Genius

Person somewhat left out (5)

Ross

I believe the answer is:

party

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

'person' is the definition.
(eg an individual in a court case)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for party that I've seen before include "Bash" , "Political organization" , "Crew" , "festive" , "Shooting weapon" .)

I've seen this clue in The Independent.
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