Check on time for charging first murderer (7)
I believe the answer is:
contain
'check' is the definition.
(I know that check can be written as contain)
'on time for charging first murderer' is the wordplay.
'time' becomes 't' (abbreviation).
'for charging' is an insertion indicator (some letters charge or go into others).
'first murderer' becomes 'Cain' (Cain killed Abel in the Bible).
'on'+'t'='ont'
'ont' put into 'cain' is 'CONTAIN'.
(Other definitions for contain that I've seen before include "Control, restrain" , "Carry" , "I cannot (anag) - hold back" , "Keep within limits or have within" , "keep within bounds" .)