Compositions sung about Egyptian god shown on tablets (8)
I believe the answer is:
choruses
'compositions' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'sung about egyptian god shown on tablets' is the wordplay.
'sung about' becomes 'c' (I can't justify this - if you can you should give a lot more credence to this answer).
'egyptian god' becomes 'horus' (Horus is an example).
'shown on' means one lot of letters go next to another.
'tablets' becomes 'es' (E can refer to an ecstasy tablet).
'c'+'horus'+'es'='CHORUSES'
Can you help me to learn more?
(Other definitions for choruses that I've seen before include "Groups of singers or song refrains" , "Choral numbers" , "Repeated parts of song" , "Parts of songs repeated after each verse" , "Parts of songs where soloist is joined by group of singers" .)