On which there can be no cryptically taped message (7)
I believe the answer is:
notepad
'message' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'on which there can be no cryptically taped' is the wordplay.
I cannot quite see how this works, but
'no' could be 'o' (O resembles 0) and 'o' is located in the answer.
an anagram of 'taped' is 'tepad' which is located in the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
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" .)