Cryptic crossword clue
It's Parisian imprisoning a soldier most guarded 7

The most common and most likely answer to this crossword clue is the 7 letter word CAGIEST

I've seen this crossword clue in The Times
C
A
G
I
E
S
T


Buddy explains!

The straight part
We know that "most guarded" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most guarded = cagiest.
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 CAGIEST mean?

CAGIEST adjective
  1. Wary, careful, shrewd.
  2. Uncommunicative; unwilling or hesitant to give information.

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