A foreign action keeps police in two minds (9)
I believe the answer is:
undecided
'in two minds' is the definition.
(I've seen this before)
'a foreign action keeps police' is the wordplay.
'a foreign' becomes 'un' ('a' translated into French).
'action' becomes 'deed' (deed is a kind of action).
'keeps' indicates putting letters inside (inserted letters are kept inside).
'police' becomes 'CID' (abbreviation for Criminal Investigation Department).
'deed' placed around 'cid' is 'decided'.
'un'+'decided'='UNDECIDED'
(Other definitions for undecided that I've seen before include "Not certain" , "With mind not yet made up" , "In two minds" , "Dithering" , "Irresolute" .)