Guided by a little light (3)
I believe the answer is:
led
This might be a double definition.
'guided' is the first definition.
('lead' can be a synonym of 'guide')
'a little light' is the second definition.
'led' can be an answer for 'light' (abbreviation for light emitting diode). I'm not certain of the 'a little' bit.
'by' is the link.
Can you help me to learn more?
(Other definitions for led that I've seen before include "Emitter of light" , "Conducted" , "Went at the head of others" , "Was guiding" , "Something emitting light" .)