Crossword Genius

Matzo's lack (5)

Ross

I believe the answer is:

yeast

'matzo's lack' 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 "As yet (anag)" , "It's put in to raise" , "Baker's raising agent" , "Fungus used in fermenting" , "Dough-raising agent" .)

I've seen this clue in the LA Times and the Universal.
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