The most common and most likely answer to this crossword clue is the 6 letter word EMBARK
E
M
B
A
R
K
More clues leading to the result EMBARK
- Board rescue vessel after English doctor
- Board eastern rescue vessel, holding medical degree
- Board formed by setter, backing another setter’s report
- Board’s academic qualification obtained by queen before king
- Board emergency meeting starts by tree outside
- Board game’s ending with bishop in spot
- British ship has space on board
- Book into space ship and board
- Get on when setter returns 2’s ruff, say
- Space in front of bay to take ship
Buddy explains!

The straight part
We know that "Board" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case board = embark.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 EMBARK mean?
EMBARK verb- To get on a boat or ship or (outside the USA) an aeroplane.
- To start, begin.
- To cause to go on board a vessel or boat; to put on shipboard.
- To engage, enlist, or invest (as persons, money, etc.) in any affair.