The most common and most likely answer to this crossword clue is the 6 letter word CRUSOE
I've seen this crossword clue in The Times
C
R
U
S
O
E
More clues leading to the result CRUSOE
- Islander caught fishy food around America
- We hear ship’s company do needlework forcastaway
- Island dweller heard from ships company? Very much
- Man washed up — after giving off of course
- Castaway picked up broadcast by sailors
- Sailor in trouble changing course
- Sailors then picked up castaway
- Conservative philosopher sounds like he was isolated
- The sailors — say 50 — seemingly leave the last one stranded
- One stranded sailors thus hailed
Buddy explains!

The straight part
We know that "Man washed up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case man washed up = crusoe.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.