The most common and most likely answer to this crossword clue is the 8 letter word GLISTENS
I've seen this crossword clue in Financial Times
G
L
I
S
T
E
N
S
More clues leading to the result GLISTENS
Buddy explains!

The straight part
We know that "Shines" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shines = glistens.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 GLISTENS mean?
GLISTENS verb- (of a wet or greasy surface) To reflect light with a glittering luster; to sparkle, coruscate, glint or flash.