Part of maturing row not developed towards centre (7)

I believe the answer is:

ingrown

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'developed towards centre' is the definition.
I can't judge whether this defines the answer.

'part of maturing row not' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'INGROWN' is hidden in the letters of 'maturing row not'.

Can you help me to learn more?

(Other definitions for ingrown that I've seen before include "Worn gin (anag.)" , "Like some toenails" , "with innate quality" , "misplaced nail" , "Innate; inward-looking" .)

I've seen this clue in The Telegraph.

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