The most common and most likely answer to this crossword clue is the 8 letter word ATTAINED
I've seen this crossword clue in The Guardian
A
T
T
A
I
N
E
D
Buddy explains!

The straight part
We know that "hit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hit = attained.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 ATTAINED mean?
ATTAINED verb- To gain (an object or desired result).
- To reach or come to, by progression or motion; to arrive at (a place, time, state, etc.).
- To come or arrive, by motion, growth, bodily exertion, or efforts toward a place, object, state, etc.
- To get at the knowledge of.
- To reach in excellence or degree.
- To reach a person after being behind them.
- (of a goal) Having been achieved or reached.