Crossword Genius

Nothing we're told in letter is permissible (4)

Ross

I believe the answer is:

okay

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

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

'nothing we're told in letter' is the wordplay.
I cannot really see how this works, but
'nothing' could be 'o' (looks like zero - 0) and 'o' is found in the answer.
'letter' could be 'kay' (I have seen 'Eleventh letter ' mean 'kay' so perhaps 'letter' could also mean 'kay') and 'kay' is found within the answer.
No letters remain.
This explanation may well be incorrect...

'is' acts as a link.

Can you help me to learn more?

(Other definitions for okay that I've seen before include "Passable" , "Alright" , "Permissible; fairly good" , "Agree" , "Informally, all right" .)

I've seen this clue in The Irish Times.
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