The most common and most likely answer to this crossword clue is the 9 letter word CURTAINED
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Buddy explains!
The straight part
We know that "concealed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case concealed = curtained.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 CURTAINED mean?
CURTAINED verb- To cover (a window) with a curtain; to hang curtains.
- To hide, cover or separate as if by a curtain.
- Covered or partitioned with a curtain or curtains.
- Hidden or separated as if by a curtain.
- (in compounds) Hung with a curtain or curtains of a specified type.