Crossword Genius

Often numbered container (3)

Ross

I believe the answer is:

box

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

'container' is the definition.
(I know that box is a type of container)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for box that I've seen before include "Christmas present" , "Wooden case" , "Punch" , "Carton" , "Fight; tree; container" .)

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