Crossword Genius

Leavening agent (5)

Ross

I believe the answer is:

yeast

'leavening agent' is the definition.
(I've seen this in another clue)

This is all the clue.

(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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