The most common and most likely answer to this crossword clue is the 7 letter word CURTALS
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The straight part
We know that "they’re docked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’re docked = curtals.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 CURTALS mean?
CURTALS noun- A variety of short-barrelled cannon.
- An early type of bassoon.
- A horse or other animal having a docked tail.
- Anything docked or cut short.