Forbidden to frame message finally β on this? (7)
I believe the answer is:
notelet
'finally on this?' is the definition.
The definition suggests a singular noun which matches the answer.
'forbidden to frame message' is the wordplay.
I cannot really understand how this works, but
'message' could be 'note' (note is a kind of message) and 'note' is found in the answer.
The remaining letters 'let' is a valid word 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 notelet that I've seen before include "Short annotation or letter" , "Decorative missive" , "short written message" , "correspondence" , "Paper for informal letter" .)