Release a bit of cricket equipment (4)

I believe the answer is:

bail

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'release' is the definition.
(I have seen 'Conditional release' mean 'bail' so perhaps 'release' could also mean 'bail')

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

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(Other definitions for bail that I've seen before include "Money lodged to secure release pending trial" , "one puts up then another jumps?" , "Wooden bar" , "Security for release from custody" , "Security for temporary release" .)

I've seen this clue in The Guardian.

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