Some upsetting nightmare possibly in Ring, for one (5)
I believe the answer is:
opera
'ring for one' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'some upsetting nightmare possibly' is the wordplay.
'upsetting' says the letters should be written in reverse.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'arepo' is hidden in the letters of 'nightmare possibly'.
'arepo' written backwards gives 'OPERA'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for opera that I've seen before include "La Traviata or Tosca, say" , "Billy Budd, for instance" , "Eg, La traviata" , "Macbeth, perhaps" , "Eg, The Magic Flute" .)