The most common and most likely answer to this crossword clue is the 6 plus 5 letter word BURIAL PLACE
I've seen this crossword clue in The Daily Telegraph
B
U
R
I
A
L
P
L
A
C
E
Buddy explains!
The straight part
We know that "Plot in which there’s no survivor?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plot in which there’s no survivor? = burial place.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.