Hot surface in good puzzle (7)
I believe the answer is:
griddle
'hot surface in good puzzle' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'good puzzle' is the wordplay.
'good' becomes 'g' (abbreviation).
'puzzle' becomes 'riddle' (a riddle is a puzzle or problem).
'g'+'riddle'='GRIDDLE'
Can you help me to learn more?
(Other definitions for griddle that I've seen before include "cooking utensil" , "Flat heated surface used for cooking" , "cooking accessory" , "Circular iron plate used for baking" , "Cook" .)