Wonderful-sounding hearth (5)
I believe the answer is:
grate
'hearth' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'wonderful-sounding' is the wordplay.
'wonderful' becomes 'great' (I've seen this before).
'sounding' shows a homophone (sound like).
'great' is a homophone of 'GRATE'.
Can you help me to learn more?
(Other definitions for grate that I've seen before include "Firebasket" , "part of fireplace" , "in which Santa lands?" , "Reduce to small shreds" , "Great (anag.)" .)