Crossword Genius

Is youngster allowed to eat here? (7)

Ross

I believe the answer is:

canteen

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

'allowed to eat here?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'is youngster' is the wordplay.
I cannot quite understand how this works, but
'youngster' could be 'teen' (I've seen this before) and 'teen' is located in the answer.
The remaining letters 'can' 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 canteen that I've seen before include "Cafe, flask and cutlery box" , "Set of cutlery" , "Box containing cutlery" , "Workers' restaurant" , "water bottle?" .)

I've seen this clue in The Times and the Financial Times.
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