Crossword Genius

It needs nothing more than pluck to break out of prison! (6)

Ross

I believe the answer is:

lockup

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

This clue might be a double definition.

'it needs nothing more than pluck to break' is the first definition.
The definition suggests a singular noun which matches the answer.

'prison' is the second definition.
(I know that lockup is a type of prison)

'out of' is the link.

Can you help me to learn more?

(Another definition for lockup that I've seen is " Cell for prisoners".)

I've seen this clue in the Evening Standard.
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