Certain bail -- even criminal accepts it (10)
I believe the answer is:
inevitable
'certain' is the definition.
('inevitable' can be similar in meaning to 'certain')
'bail even criminal accepts it' is the wordplay.
'criminal' is an anagram indicator.
'accepts' means one lot of letters goes inside another.
'bail'+'even'='baileven'
'baileven' is an anagram of 'inevable'.
'inevable' going around 'it' is 'INEVITABLE'.
(Other definitions for inevitable that I've seen before include "Unavoidable, fated" , "Certain to happen" , "Inescapable" .)