The man's going to ring magazine (5)
I believe the answer is:
hello
'magazine' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'the man's going to ring' is the wordplay.
I cannot quite understand how this works, but
'ring' could be 'o' (letter resembling a ring) and 'o' is located in the answer.
'going to' could be 'll' (as in he'll, we'll etc) and 'll' is located in the answer.
'man' could be 'he' (he refers to a man) and 'he' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hello that I've seen before include "Common greeting as on phone" , "A salutation" , "Welcome" , "Routine response to telephone call" , "Publication" .)