No permission for recesses (5)

I believe the answer is:

nooks

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

'recesses' is the definition.
(I've seen this in another clue)

'no permission' is the wordplay.
'permission' becomes 'oks' (I can't explain this - if you can you should give a lot more credence to this answer).
'no'+'oks'='NOOKS'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for nooks that I've seen before include "Recesses" , "Sheltered corners" , "Secluded retreats" , "out-of-the-way places" , "Corners (that go with crannies)" .)

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

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