I snoop around, a killer that's often drunk (6)
I believe the answer is:
poison
'a killer that's often drunk' is the definition.
I can't tell whether this defines the answer.
'i snoop around' is the wordplay.
'around' is an anagram indicator.
'i'+'snoop'='isnoop'
'isnoop' is an anagram of 'POISON'.
Can you help me to learn more?
(Other definitions for poison that I've seen before include "Corrupt" , "I spoon up the lethal substance" , "Bane" , "If taken, it can harm or kill" , "Damaging stuff - drink?" .)