The Story Before a Story; the One That Came Before

This page is the CodyCross answer for the clue below from Rainforest, Group 1217, Puzzle 1 (Underwater Caves).

Question is: The Story Before a Story; the One That Came Before

and the answer is: PRECURSOR

Word Meaning:

PRECURSOR — That which precurses: a forerunner, predecessor, or indicator of approaching events.

Definitions from Wiktionary.