No ecclesiastical letter from lady (3)
I believe the answer is:
lay
'no' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'ecclesiastical letter from lady' is the wordplay.
I cannot quite see how this works, but
'letter' could be 'y' (Y is a letter of the alphabet) and 'y' is located in the answer.
The remaining letters 'la' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for lay that I've seen before include "Non-clerical, amateur" , "Not a religious" , "located" , "Not ordained; song" , "Not professional" .)