Crossword Genius

Fresh drink supplier opening late (4)

Ross

I believe the answer is:

airy

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'fresh' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for airy that I've seen before include "Well-ventilated; delicate" , "Spacious; delicate" , "Light, delicate" , "Old astronomer" , "Sprightly" .)

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