Left kill to accept title of Man Hunter (6)

I believe the answer is:
nimrod
'hunter' is the definition.
(I've seen this before)
'left kill to accept title of man' is the wordplay.
'left' is a reversal indicator.
'kill' becomes 'do in' (to do in is to kill or assassinate).
'to accept' indicates putting letters inside.
'title of man' becomes 'rm' (I can't explain this - if you can you should give a lot more credence to this answer).
'doin' going around 'rm' is 'dormin'.
'dormin' back-to-front is 'NIMROD'.
Can you help me to learn more?
(Other definitions for nimrod that I've seen before include "One of Elgar's Enigma Variations" , "Noah's great-grandson, the hunter - RAF maritime patrol aircraft" , "9th Enigma Variation" , "Mighty hunter of Genesis" , "OT hunter" .)
