Baking ingredient (5)
I believe the answer is:
yeast
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">baking ingredient</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for yeast that I've seen before include "Brewing agent" , "Substance used in brewing and baking" , "Agent for making bread" , "that baker needs" , "Fungi used in bakery" .)