The most common and most likely answer to this crossword clue is the 14 letter word DOUBLE-CROSSED
I've seen this crossword clue in Independent
D
O
U
B
L
E
-
C
R
O
S
S
E
D
More clues leading to the result DOUBLE-CROSSED
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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 DOUBLE-CROSSED mean?
DOUBLE-CROSSED verb- To betray or go back on