Mark gets a ring from him (5)
I believe the answer is:
oscar
'mark' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'gets a ring from him' is the wordplay.
'gets a ring' becomes 'os' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'from' says to put letters next to each other.
'him' becomes 'Car'.
'os'+'car'='OSCAR'
Can you help me to learn more?
(Other definitions for oscar that I've seen before include "Film acting award" , "Movie award, popularly called" , "Film-prize statuette" , "One close to Mike" , "Wildean film award?" .)