Foresight of French invading region (10)
I believe the answer is:
providence
'foresight' is the definition.
(thesaurus)
'of french invading region' is the wordplay.
'of french' becomes 'de' ('of' in French).
'invading' means one lot of letters goes inside another.
'region' becomes 'province' (province is a kind of region).
'de' going inside 'province' is 'PROVIDENCE'.
(Other definitions for providence that I've seen before include "US state capital" , "tender care" , "fortune" .)