The most common and most likely answer to this crossword clue is the 6 letter word TERRET
I've seen this crossword clue in The Guardian
T
E
R
R
E
T
More clues leading to the result TERRET
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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 TERRET mean?
TERRET noun- One of the rings on the top of the saddle of a harness, through which the reins pass.