Crossword Genius

Young adult might yet, in short, set out (6-9)

Ross

I believe the answer is:

thirty-something

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

'young adult' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'might yet in short set out' is the wordplay.
'set out' indicates anagramming the letters.
'might'+'yet'+'in'+'short'='mightyetinshort'
'mightyetinshort' with letters rearranged gives 'THIRTY-SOMETHING'.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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