Crossword Genius

Have attire for ball that doesn't start (3)

Ross

I believe the answer is:

own

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'have' is the definition.
(to have something is to own it)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for own that I've seen before include "Private" , "Have in one's possession" , "Posses" , "Keep" , "Be in legal possession of (3)" .)

I've seen this clue in The Independent.
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