House in France occupied by Democrat president (7)
I believe the answer is:
madison
'president' is the definition.
(James Madison, fourth president of the USA)
'house in france occupied by democrat' is the wordplay.
'house in france' becomes 'maison' ('house' in French).
'occupied by' is an insertion indicator (inserted letters occupy or enter the word).
'democrat' becomes 'd'.
'maison' placed around 'd' is 'MADISON'.
(Other definitions for madison that I've seen before include "dance?" , "US president - New York square with gardens" , "New York Avenue for advertising people" , "4th president of the US - capital of Wisconsin" , "US president, county and square" .)