Poison that makes some live no more (5)
I believe the answer is:
venom
'poison' is the definition.
(venom is a kind of poison)
'some live no more' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'VENOM' can be found hidden inside 'live no more'.
'that makes' acts as a link.
(Other definitions for venom that I've seen before include "acrimony" , "Poisonous fluid" , "Spite: toxin" , "Bitter malice" , "Virulence" .)