Fiery remnant (5)
I believe the answer is:
ember
'fiery remnant' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ember that I've seen before include "Glowing remainder of a fire" , "It glows in dying fire" , "Glower" , "Fire remnant" , "Smouldering piece left over from a fire" .)