Crossword Genius

Not locked up for nothing (4)

Ross

I believe the answer is:

free

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'for nothing' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for free that I've seen before include "Deliver" , "Without cost; liberate" , "Available - for love" , "Not occupied; release" , "Not fixed; not in use" .)

I've seen this clue in The Independent.
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