Polygraph machine — electrode's involved with it (3,8)
I believe the answer is:
lie detector
'polygraph' is the definition.
(I've seen this before)
'electrode's involved with it' is the wordplay.
'involved with' is an anagram indicator (involved can mean confusing or complex).
'electrode' anagrammed with 'it' can make 'LIE-DETECTOR'.
'machine' acts as a link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for lie detector that I've seen before include "Device helping find truth" , "help to tell a story" , "Truth-determining device" , "that should tell stories?" , "Police polygraph" .)