Guided by a little electric light (3)
I believe the answer is:
led
This clue could be a double definition.
'guided' is the first definition.
('lead' can be a synonym of 'guide')
'a little electric light' is the second definition.
'led' can be an answer for 'light' (light-emitting diode). I'm not sure about the 'a little electric' bit.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for led that I've seen before include "Something emitting light" , "Went in advance of others" , "Shown the way" , "Took by the hand and showed the way" , "Guided; small light" .)