Radiating soft warm light in silver and blue (5)
I believe the answer is:
aglow
'radiating soft warm light' is the definition.
(aglow means glowing)
'silver and blue' is the wordplay.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'and' says to put letters next to each other.
'blue' becomes 'low' (I've seen this in another clue).
'ag'+'low'='AGLOW'
'in' acts as a link.
(Other definitions for aglow that I've seen before include "Softly bright or radiant" , "Giving out a steady light" , "Incandescent" , "Warm - shiny" , "Shining" .)