Illuminated Idea Indicator
This page is the CodyCross answer for the clue below from Top Secret, Group 2096, Puzzle 3 (Spy Satellite).
Question is: Illuminated Idea Indicator
and the answer is: LIGHTBULB
Word Meaning:
LIGHT BULB — An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
Definitions from Wiktionary.