The Bright Thing That Goes on When One Has an Idea
This page is the CodyCross answer for the clue below from Architectural Styles, Group 1171, Puzzle 1 (Gothic and Baroque).
Question is: The Bright Thing That Goes on When One Has an Idea
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.