Surety (4)
'surety' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bail that I've seen before include "One of two on the stumps" , "small bar on field" , "Horizontal piece of cricket wicket" , "Remove water from -- part of wicket" , "Topper for stumps" .)
'surety' is the definition.
(collateral is a kind of surety)
This is all the clue.
(Other definitions for collateral that I've seen before include "Aside from the main issue" , "Secondary; parallel" , "subsidiary" , "Confirmatory - recall a lot (anag)" , "Security for loan repayment; secondary" .)