Infiltrate team prepared to stop father in France (8)
I believe the answer is:
permeate
'infiltrate' is the definition.
(I've seen this before)
'team prepared to stop father in france' is the wordplay.
'prepared' indicates anagramming the letters.
'to stop' indicates putting letters inside.
'father in france' becomes 'pere' (French for 'father').
'team' with letters rearranged gives 'meat'.
'meat' put inside 'pere' is 'PERMEATE'.
(Other definitions for permeate that I've seen before include "Pass through" , "Infiltrate" , "Spread throughout" , "Percolate" , "Imbue, spread through" .)