The most common and most likely answer to this crossword clue is the 6 letter word SAILOR
I've seen this crossword clue in Financial Times
S
A
I
L
O
R
More clues leading to the result SAILOR
- Crew member said Lord loses every day
- 10 shillings, first class? Good Lord!
- Trouble very much engulfs Republican rating
- Type docked round area by island lake?
- ‘Rating scales are infamously low on reliability’, heads read
- An ABC-man, say?
- Jack‘s in patrol I ask about
- Man on smack?
- Might we think that only the Queen is more common than this traveller? In the main
- Suit, shirt replaced by dresser essentially for seaman
Buddy explains!

The straight part
We know that "10" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 10 = sailor.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 SAILOR mean?
SAILOR noun- A person in the business of navigating ships or other vessels
- Someone knowledgeable in the practical management of ships.
- A member of the crew of a vessel; a mariner; a common seaman.
- A person who sails sailing boats as a sport or recreation.
- Any of various nymphalid butterflies of the genera Neptis, Pseudoneptis and Phaedyma, having white markings on a dark base and commonly flying by gliding.