Crossword Genius

Leavening agent (5)

Ross

I believe the answer is:

yeast

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">leavening agent</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 "that baker needs" , "fermenter" , "A raising agent in baking" , "Fungus used to ferment sugar" , "Baker's ingredient" .)

I've seen this clue in The Telegraph, The Independent and the Universal.
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