Sent over to murder, stopped by Mr Hunter (6)
I believe the answer is:
nimrod
'hunter' is the definition.
(thesaurus)
'sent over to murder stopped by mr' is the wordplay.
'sent over' says the letters should be written in reverse.
'to murder' becomes 'doin' (I've seen this before).
'stopped by' means one lot of letters goes inside another (I've seen this in other clues).
'doin' written backwards gives 'niod'.
'niod' enclosing 'mr' is 'NIMROD'.
(Other definitions for nimrod that I've seen before include "Dim Ron was a bad Biblical hunter" , "OT hunter" , "Best-known of Elgar's Enigma Variations" , "Skilful hunter (Genesis)" , "'Mighty Biblical ruler, builder of the Tower of Babel (6)'" .)