Cryptic crossword clue
Failed to fence wood that’s prohibited 10

The most common and most likely answer to this crossword clue is the 10 letter word DISALLOWED

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "prohibited" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case prohibited = disallowed.
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.

Crossword Answer definitions

DISALLOWED verb
  1. To refuse to allow
  2. To reject as invalid, untrue, or improper
DISALLOWED adjective
  1. Forbidden
  2. Invalid

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