Crossword Genius

Mature writer supporting conclusion of younger one (5)

Ross

I believe the answer is:

ripen

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'mature' is the definition.
(to ripen is to mature)

'writer supporting conclusion of younger one' is the wordplay.
'writer' becomes 'I' (the person who is writing these clues).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'conclusion of' says to take the final letters.
'one' becomes 'pen' (I can't justify this - if you can you should believe this answer much more).
The final letter of 'younger' is 'r'.
'i' after 'r' is 'ri'.
'ri'+'pen'='RIPEN'

Can you help me to learn more?

(Other definitions for ripen that I've seen before include "Grow older" , "Become ready to pick" , "Become ready to eat" , "Make ready" , "Become mature" .)

I've seen this clue in The Telegraph.
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