Crossword Genius

Let out once or twice (8)

Ross

I believe the answer is:

released

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'let out' is the definition.

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

Can you help me to learn more?

(Other definitions for released that I've seen before include "Liberated" , "Let out - let out again" , "Sent from prison" , "Discharged" , "free after imprisonment?" .)

I've seen this clue in The Telegraph.
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