Add Yeast to Bread So It Will Rise

This page is the CodyCross answer for the clue below from Space Exploration, Group 920, Puzzle 1 (Hydrogen and Helium).

Question is: Add Yeast to Bread So It Will Rise

and the answer is: LEAVEN

Word Meaning:

LEAVEN — Any agent used to make dough rise or to have a similar effect on baked goods.

Definitions from Wiktionary.