Warm spot in hot planet (6)
I believe the answer is:
hearth
'warm spot' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'hot planet' is the wordplay.
'hot' becomes 'h' (abbreviation eg on taps).
'planet' becomes 'earth' (Earth is an example).
'h'+'earth'='HEARTH'
'in' is the link.
Can you help me to learn more?
(Other definitions for hearth that I've seen before include "fireside feature" , "Fireplace surround" , "part of furnace" , "Novel" , "Part of fireplace symbolising home" .)