Glowing remnant (5)
I believe the answer is:
ember
'glowing 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, smouldering piece of coal or wood" , "Glowing coal; type of goose" , "Just a glimmer" , "what causes a warm glow" , "Small piece of glowing coal in a dying fire" .)