He will ring - to get this response? (5)
I believe the answer is:
hello
'get this response?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'he will ring' is the wordplay.
'will' becomes ''ll' (contracted form, as in 'he'll' - 'he will').
'ring' becomes 'o' (letter resembling a ring).
'he'+'ll'+'o'='HELLO'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for hello that I've seen before include "Conversation starter" , "Hi, howdy" , "Common greeting as on phone" , "Greeting - celebrity magazine" , "Look at that" .)