The most common and most likely answer to this crossword clue is the 6 letter word LANDED
I've seen this crossword clue in Financial Times
L
A
N
D
E
D
More clues leading to the result LANDED
Buddy explains!

The straight part
We know that "reached the shore" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reached the shore = landed.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 LANDED mean?
LANDED verb- To descend to a surface, especially from the air.
- To alight, to descend from a vehicle.
- To come into rest.
- To arrive at land, especially a shore, or a dock, from a body of water.
- To bring to land.
- To acquire; to secure.
- To deliver.
- In possession of land.
- Consisting of land, especially with a single owner.