Twig it's some sort of electrical device (6)
I believe the answer is:
switch
This clue might be a double definition.
'twig' is the first definition.
(thesaurus)
'electrical device' is the second definition.
(I've seen this before)
'it's some sort of' acts as a link.
This may not be right. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for switch that I've seen before include "Device for opening and closing electric circuits" , "Change over - whip" , "birch" , "One may be off" , "Exchange positions for flexible rod or whip" .)