Development of teenager by provocation initially true to form (7)

I believe the answer is:

puberty

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'development of teenager' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'by provocation initially true to form' is the wordplay.
'initially' suggests taking the first letters.
'to form' is an anagram indicator.
The first letter of 'provocation' is 'p'.
'by'+'p'+'true'='byptrue'
'byptrue' anagrammed gives 'PUBERTY'.

Can you help me to learn more?

(Other definitions for puberty that I've seen before include "Beginning of adolescence" , "Difficult time for an adolescent" , "Start of sexual maturity" .)

I've seen this clue in The Guardian.

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