Game Show Once Hosted by Alex Trebek
This page is the CodyCross answer for the clue below from Physics, Group 1890, Puzzle 4 (Photometer).
Question is: Game Show Once Hosted by Alex Trebek
and the answer is: JEOPARDY
Word Meaning:
JEOPARDY — Danger of failure, harm, or loss.
Definitions from Wiktionary.