Killer (8)
'killer' is the definition.
(murderer is a kind of killer)
This is all the clue.
(Other definitions for murderer that I've seen before include "Criminal killer" , "Serious criminal enters demurrer" , "hit man" , "Assassin" , "Deliberate unlawful killer" .)
'killer' is the definition.
(assassin is a kind of killer)
This is the entire clue.
(Other definitions for assassin that I've seen before include "Murderer (of prominent figure)" , "Liquidator" , "Booth, for example" , "I kill" , "Murderer, killer" .)
'killer' is the definition.
(I know that killer can be written as slayer)
This is all the clue.
(Other definitions for slayer that I've seen before include "Violent killer" , "Butcher" , "Violent murderer" , "Relays to killer" , "Assassin" .)
'killer' is the definition.
(serial killer is a kind of killer)
This is all the clue.
(Other definitions for serial that I've seen before include "Story published in instalments" , "Story published in parts" , "show" , "In a sequence" , "Set of TV shows" .)