Bar on cricket pitch sometimes jumped by miscreants? (4)
I believe the answer is:
bail
'bar' is the definition.
(bar on a cricket wicket)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for bail that I've seen before include "may be jumped" , "Security to guarantee apperance of prisoner" , "Security for release from custody" , "In cricket, wooden cross-piece placed on stumps" , "Partition in stable" .)