The most common and most likely answer to this crossword clue is the 6 letter word GLEAMS
I've seen this crossword clue in The Guardian
G
L
E
A
M
S
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 GLEAMS mean?
GLEAMS noun- A small or indistinct shaft or stream of light.
- A glimpse or hint; an indistinct sign of something.
- Brightness or shininess; splendor.
- To shine; to glitter; to glisten.
- To be briefly but strongly apparent.
- To disgorge filth, as a hawk.