The most common and most likely answer to this crossword clue is the 11 letter word DECOLLETAGE
I've seen this crossword clue in The Guardian
D
E
C
O
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L
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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 DECOLLETAGE mean?
DECOLLETAGE noun- A low neckline on a woman's dress, especially one that reveals or emphasizes her cleavage.
- The portion of a woman's body that is revealed by a low neckline; the upper chest, as well, sometimes, as the neck, and shoulders.