Crossword Genius

Guided by a light-emitting diode (3)

Ross

I believe the answer is:

led

I believe this clue is a double definition.

'guided' is the first definition.
(similar in meaning)

'a light-emitting diode' is the second definition.
('LED' can be a synonym of 'light-emitting diode')

'by' is the link.

(Other definitions for led that I've seen before include "Went in advance of others" , "Was guiding" , "showed the way ahead" , "induced to" , "Came first" .)

I've seen this clue in the Evening Standard.
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