Drive shown by one politician in France and America (7)
I believe the answer is:
impetus
'drive' is the definition.
(impetus is a kind of drive)
'one politician in france and america' is the wordplay.
'one politician' becomes 'imp' (I've seen this in other clues**).
'in france' becomes 'et' (I've seen this in other clues).
'and' is a charade indicator (letters next to each other).
'america' becomes 'us' (abbreviation for the United States).
'imp'+'et'+'us'='IMPETUS'
'shown by' is the link.
(Other definitions for impetus that I've seen before include "Motivation" , "Incentive, stimulus" , "Thrust" , "influence" , "Imputes to force with which a body moves" .)