The most common and most likely answer to this crossword clue is the 8 letter word UNEARTHS
I've seen this crossword clue in The Times
U
N
E
A
R
T
H
S
Buddy explains!

The straight part
We know that "Discovers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case discovers = unearths.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 UNEARTHS mean?
UNEARTHS verb- To drive or draw from the earth.
- To uncover or find; to bring out from concealment
- To dig up.