Crossword Genius

Superlatively youthful (8)

Ross

I believe the answer is:

youngest

I'm a little stuck... Click here to teach me more about this clue!

'superlatively youthful' is the definition.
I can't tell whether this defines the answer.

'youthful' is the wordplay.
I cannot really understand how this works, but
'youthful' could be 'young' (similar in meaning) and 'young' is found in the answer.
The remaining letters 'est' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for youngest that I've seen before include "Least old" , "Most junior" , "least experienced" , "last born" , "Ath the earliest stage of development" .)

I've seen this clue in the Evening Standard.
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