The most common and most likely answer to this crossword clue is the 8 letter word SHERLOCK
I've seen this crossword clue in The Guardian
S
H
E
R
L
O
C
K
More clues leading to the result SHERLOCK
Buddy explains!

The straight part
We know that "As solver" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as solver = sherlock.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 SHERLOCK mean?
SHERLOCK verb- To deduce.
- To search.
- To obsolete a unique feature in third-party software by introducing a similar or identical feature to the OS or a first-party program/app.