The most common and most likely answer to this crossword clue is the 8 letter word OUTSHONE
I've seen this crossword clue in The Guardian
O
U
T
S
H
O
N
E
More clues leading to the result OUTSHONE
Buddy explains!

The straight part
We know that "left standing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case left standing = outshone.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 OUTSHONE mean?
OUTSHONE verb- To shine brighter than something else
- To exceed something or someone else, especially in an obvious or flamboyant manner
- To shine forth.