For bread as yet to be mixed (5)

I believe the answer is:

yeast

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'for bread' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'as yet to be mixed' is the wordplay.
'to be mixed' indicates an anagram.
'as'+'yet'='asyet'
'asyet' anagrammed gives 'YEAST'.

Can you help me to learn more?

(Other definitions for yeast that I've seen before include "It's put in to raise" , "Alcohol-producing fungus" , "Baker's raising agent" , "Fungus used in brewing and baking" , "Bread-making component" .)

I've seen this clue in The Globe and Mail.

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