Cryptic crossword clue
  Tree to twist over width of type of recess in wall 3,6

The most common and most likely answer to this crossword clue is the 3 plus 6 letter word BAY WINDOW

I've seen this crossword clue in Independent
B
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W
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W

Buddy explains!

The straight part
We know that "type of recess in wall" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of recess in wall = bay window.
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.

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