Crossword Genius

Open or unopened milk container? (4)

Ross

I believe the answer is:

airy

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'open' is the definition.
(both can mean spacious)

I don't understand the remainder of the clue.

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(Other definitions for airy that I've seen before include "Breezy" , "Ethereal" , "Delicate; dismissive" , "Well-ventilated; casual" , "affecting nonchalance" .)

I've seen this clue in The Independent.
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