The most common and most likely answer to this crossword clue is the 11 letter word SILHOUETTES
I've seen this crossword clue in Financial Times
S
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L
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Buddy explains!
The straight part
We know that "Shadows" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shadows = silhouettes.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 SILHOUETTES mean?
SILHOUETTES noun- An illustrated outline filled in with a solid color(s), usually only black, and intended to represent the shape of an object without revealing any other visual details; a similar appearance produced when the object being viewed is situated in relative darkness with brighter lighting behind it; a profile portrait in black, such as a shadow appears to be.
- To represent by a silhouette; to project upon a background, so as to be like a silhouette.