Cryptic crossword clue
Guinevere’s retiring kit – after transition, we’re told Lancelot’s possibly! 10

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

I've seen this crossword clue in Financial Times
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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 NIGHTDRESS mean?

NIGHTDRESS noun
  1. A nightgown; female attire designed to be worn to bed.

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