Crossword Genius

Permission unavailable? You don't say! (5,3)

Ross

I believe the answer is:

leave out

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

'you don't say' is the definition.
I can't judge whether this definition defines the answer.

'permission unavailable?' is the wordplay.
'permission' becomes 'leave' (leave is permission or authorisation).
'unavailable?' becomes 'out' (I've seen this in another clue).
'leave'+'out'='LEAVE OUT'

Can you help me to learn more?

(Other definitions for leave out that I've seen before include "Omit or exclude" , "Forget" , "Omit, overlook" , "not put away" , "Drop" .)

I've seen this clue in the Evening Standard.
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