Mean girl somehow beginning to develop (8)

I believe the answer is:

germinal

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'beginning to develop' is the definition.
I can't judge whether this defines the answer.

'mean girl somehow' is the wordplay.
'somehow' indicates an anagram.
'mean'+'girl'='meangirl'
'meangirl' with letters rearranged gives 'GERMINAL'.

Can you help me to learn more?

(Other definitions for germinal that I've seen before include "Malinger in the earliest stage of development" , "a month after the French Revolution" , "Novel by Zola; in an early stage of development" , "In a sort of cell" , "Rudimentary" .)

I've seen this clue in The Telegraph.

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