Crossword Genius

Adolescent requiring support with last bit of revision (4)

Ross

I believe the answer is:

teen

'adolescent' is the definition.
(teenager)

'support with last bit of revision' is the wordplay.
'support' becomes 'tee' (tee is a kind of support).
'with' is a charade indicator (letters next to each other).
'last bit of' says to take the final letters.
The final letter of 'revision' is 'n'.
'tee'+'n'='TEEN'

'requiring' is the link.

(Other definitions for teen that I've seen before include "Young person" , "Youngster of a certain age" , "Youngster over twelve" , "Adolescent (informal)" , "Youth" .)

I've seen this clue in The Times.
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