Crossword Genius

Available and unavailable (3)

Ross

I believe the answer is:

out

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

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for out that I've seen before include "Old hat" , "In error" , "jury considering verdict" , "Unacceptable" , "Extinguished; abroad" .)

I've seen this clue in The Sun.
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