Truly a live rat I slaughtered? Just an experience via a headset! (7,7)
I believe the answer is:
virtual reality
'an experience via a headset' is the definition.
I can't tell whether this defines the answer.
'truly a live rat i slaughtered?' is the wordplay.
'slaughtered?' indicates an anagram (I've seen 'slaughtered' mean this).
'truly'+'a'+'live'+'rat'+'i'='trulyaliverati'
'trulyaliverati' with letters rearranged gives 'VIRTUAL REALITY'.
'just' acts as a link.
Can you help me to learn more?
(Other definitions for virtual reality that I've seen before include "fantasy world generated by compter" , "Computer-generated world" , "Simulation" .)