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It's Parisian imprisoning a soldier most guarded (7)

Ross

I believe the answer is:

cagiest

'most guarded' is the definition.

'it's parisian imprisoning a soldier' is the wordplay.
'it's parisian' becomes 'cest' ('c'est' is French for 'it is').
'imprisoning' is an insertion indicator.
'soldier' becomes 'gi' (government issue or general issue).
'a'+'gi'='agi'
'cest' enclosing 'agi' is 'CAGIEST'.

(Another definition for cagiest that I've seen is " Most cautious about giving information".)

I've seen this clue in The Times.
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