Favouring Christian philosopher’s prediction (10)
I believe the answer is:
prognostic
'philosopher's prediction' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'favouring christian' is the wordplay.
'favouring' becomes 'pro' (being in favour of something).
'christian' becomes 'gnostic' (I can't justify this - if you can you should give a lot more credence to this answer).
'pro'+'gnostic'='PROGNOSTIC'
Can you help me to learn more?
(Other definitions for prognostic that I've seen before include "Making prediction" , "Sign" .)