A student a school admitted (3,2)

I believe the answer is:

let on

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'a student a school admitted' is the definition.
I can't judge whether this defines the answer.

'a student a school' is the wordplay.
'a student' becomes 'l' (as in L-plates for learner drivers).
'a school' becomes 'eton' (famous UK public school).
'l'+'eton'='LET ON'

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(Other definitions for let on that I've seen before include "Allow to board, or pretend" , "Divulge info; pretend" , "Divulge (secret to)" , "Be revealing" , "Disclose awareness" .)

I've seen this clue in The Daily Express.

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