The most common and most likely answer to this crossword clue is the 6 letter word AGLEAM
I've seen this crossword clue in The Daily Telegraph
A
G
L
E
A
M
More clues leading to the result AGLEAM
- Shining silver lead for hound
- Shining silver meadow with a hint of mist
- Shining silver lamé creation
- Sparkling silver accompanying cooked meal
- Shining silver light almost encircling earth
- Education officials in formal meeting becoming incandescent
- Shining silver pound sweetheart’s pocketed
- Beaming as a good meal’s dished up
- Shining as bird of prey heading off in the morning
- Bright girl taken in by a cunning male
Buddy explains!

The straight part
We know that "Shining" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shining = agleam.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 AGLEAM mean?
AGLEAM adjective- Glowing with subdued light.