Crossword Genius

One of the larger microbes? (4)

Ross

I believe the answer is:

germ

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

'of the larger microbes?' is the wordplay.
'of' says the answer is hidden in the clue.
'GERM' can be found hidden inside 'larger microbes'.

Can you help me to learn more?

(Other definitions for germ that I've seen before include "source of infection?" , "Minute lifeform" , "Rudiment" , "Start of an idea" , "First idea; seed embryo" .)

I've seen this clue in the Evening Standard.
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