The most common and most likely answer to this crossword clue is the 10 letter word ENLIGHTENS
E
N
L
I
G
H
T
E
N
S
Buddy explains!

The straight part
We know that "shows" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shows = enlightens.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 ENLIGHTENS mean?
ENLIGHTENS verb- To supply with light.
- To make something clear to (someone); to give knowledge or understanding to.