Youngster ate green fresh produce (8)

I believe the answer is:

teenager

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

'youngster' is the definition.
(I know that teenager is a type of youngster)

'ate green fresh produce' is the wordplay.
'ate green' can be anagrammed to 'TEENAGER'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for teenager that I've seen before include "one no longer twelve?" , "Young person" , "hormonal problem?" , "one that's not yet made a score?" , "14, perhaps" .)

I've seen this clue in The Globe and Mail.

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