Ends of regular English poetry by the writer may show this feature (5)
I believe the answer is:
rhyme
'show this feature' 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?
'ends of regular english poetry by the writer' is the wordplay.
'ends of' indicates one should take the final letters (I've seen 'end of' mean this).
'by' means one lot of letters go next to another.
'the writer' becomes 'me' (the person who wrote the clues).
The final letters of 'regular english poetry' are 'rhy'.
'rhy'+'me'='RHYME'
'may' is the link.
Can you help me to learn more?
(Other definitions for rhyme that I've seen before include "Short piece of verse" , "anticipated by a nursery perhaps" , "(Of words) sound the same" , "something read" , "Be like 'cat' and 'mat'" .)