Cryptic crossword clue
Closet open, used mysteriously to hide cross 9

The most common and most likely answer to this crossword clue is the 9 letter word UNEXPOSED

I've seen this crossword clue in The Sunday Telegraph
U
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Buddy explains!

The straight part
We know that "Closet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case closet = unexposed.
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 UNEXPOSED mean?

UNEXPOSED adjective
  1. That has not been exposed

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