The most common and most likely answer to this crossword clue is the 8 letter word ARRIVING
I've seen this crossword clue in Independent
A
R
R
I
V
I
N
G
Buddy explains!
The straight part
We know that "reaching destination" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reaching destination = arriving.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 ARRIVING mean?
ARRIVING verb- To reach; to get to a certain place.
- To obtain a level of success or fame; to succeed.
- To come; said of time.
- To happen or occur.
- To reach; to come to.
- To bring to shore.