Glowing coal (5)
I believe the answer is:
ember
'glowing coal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ember that I've seen before include "Wood still burning" , "It glows in dying fire" , "Glowing coal; type of goose" , "Piece of live coal" , "Still smouldering fragment of wood or coal" .)