The most common and most likely answer to this crossword clue is the 5 letter word AGLOW
I've seen this crossword clue in The Daily Telegraph
A
G
L
O
W
More clues leading to the result AGLOW
- Radiant silver-blue
- Brilliant silver-blue combo?
- Bright wife, Russian woman from the east
- Bright metallic element, blue
- Smouldering with rage, at heart depressed
- Russian girl turned away from wife: such a flaming cheek!
- Shining silver base
- Shining precious metal, blue
- Radiant silver luminance over town centre
- Silver and blue, radiant
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does AGLOW mean?
AGLOW adjective- (sometimes figurative) glowing; radiant