Crossword Genius

On which there can be no cryptically taped message (7)

Ross

I believe the answer is:

notepad

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

'message' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'on which there can be no cryptically taped' is the wordplay.
I cannot really see how this works, but
'no' could be 'o' (O resembles 0) and 'o' is present in the answer.
an anagram of 'taped' is 'tepad' which is within the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for notepad that I've seen before include "type of computer" , "Small block of writing paper" , "Block of writing paper; computer" , "Memo-block" , "Jotter; pocket computer" .)

I've seen this clue in the Evening Standard.
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