The most common and most likely answer to this crossword clue is the 8 letter word CASTAWAY
C
A
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T
A
W
A
Y
More clues leading to the result CASTAWAY
- South of cape, choice of routes for ill-starred traveller
- Players missing Robinson Crusoe?
- Rejected actors over 42nd Street, for one
- Actors with a method to portray Robinson Crusoe?
- Actors on holiday for film
- Perhaps Crusoe’s reason for putting nothing on?
- One abandoned actors with a Method
- Why theatre can’t perform Robinson Crusoe?
- Game lacking a new style is worthless
- Abandon players on holiday
Buddy explains!

The straight part
We know that "person left at sea" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person left at sea = castaway.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 CASTAWAY mean?
CASTAWAY noun- A shipwrecked sailor.
- A discarded person or thing.
- An outcast; someone cast out of a group or society.
- Cast adrift or ashore; marooned.
- Shipwrecked.
- Cast out; rejected or excluded from a group.