Pantomime character is hot stuff! (7)
I believe the answer is:
cinders
'pantomime character is hot stuff' is the definition.
I can't judge whether this definition defines the answer.
'character is hot stuff' is the wordplay.
I cannot really understand how this works, but
'character' could be 's' and 's' is located in the answer.
'hot' could be 'in' (both can mean fashionable) and 'in' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cinders that I've seen before include "Embers" , "girl kept at home" , "Pieces of partly burned coal" .)