As yet developing growth on grape vine (5)

I believe the answer is:

yeast

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'growth on grape vine' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'as yet developing' is the wordplay.
'developing' indicates an anagram.
'as'+'yet'='asyet'
'asyet' is an anagram of 'YEAST'.

Can you help me to learn more?

(Other definitions for yeast that I've seen before include "It makes dough rise" , "Androgynous" , "Bread-making component" , "Brewer" , "Organism causing fermentation" .)

I've seen this clue in the Evening Standard.

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