The most common and most likely answer to this crossword clue is the 12 letter word SUSPICIOUSLY
I've seen this crossword clue in The Times
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More clues leading to the result SUSPICIOUSLY
Buddy explains!
The straight part
We know that "with caution" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with caution = suspiciously.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 SUSPICIOUSLY mean?
SUSPICIOUSLY adverb- (manner) In a way suggesting suspicion.
- (manner) In a way that arouses suspicion.
- (evaluative) Causing suspicion.
- (degree) To a degree that makes one suspect something.