The most common and most likely answer to this crossword clue is the 2 plus 6 letter word AT LENGTH
I've seen this crossword clue in The Times
A
T
L
E
N
G
T
H
More clues leading to the result AT LENGTH
- Large English translation of that goes around, eventually
- That glen is to collapse eventually
- With Liberal England on board, that changes eventually
- Tiresome types speak thus in due course
- Glen that gets spoilt eventually
- Swimmer’s first goal, winning tight finish comprehensively
- In great detail, eventually
- Without working Siri, straight line travelling taking ages
- That glen drawn extensively
- Tiresome types speak thus in due course
Buddy explains!

The straight part
We know that "eventually" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case eventually = at length.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.