Let live (6)
I believe the answer is:
spared
'let live' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spared that I've seen before include "Voluntarily parted with" , "forgiven" , "Dealt leniently with" , "Showed mercy, refrained from hurting" , "Unharmed" .)