Cryptic crossword clue
Devious devil, one sort of agent briefly turning to wit 9

The most common and most likely answer to this crossword clue is the 9 letter word VIDELICET

I've seen this crossword clue in The Times
V
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D
E
L
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Buddy explains!

The straight part
We know that "to wit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to wit = videlicet.
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 VIDELICET mean?

VIDELICET adverb
  1. Namely, to wit, that is to say (used when clarifying or naming the preceding item or topic)

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