Hopeless, after Bishop released stuff not meant for release? (4)

I believe the answer is:

leak

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'for release?' is the definition.
(I have seen 'Accidental release ' mean 'leak' so perhaps 'release' could also mean 'leak')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for leak that I've seen before include "Accidental escape of water from lake" , "Disclose unauthorised information" , "Seep; disclose" , "Ooze" , "Secrecy breach" .)

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