Investor in France managed to capture his heart (9)
I believe the answer is:
financier
'investor' is the definition.
(I've seen this before)
'in france managed to capture his heart' is the wordplay.
'managed' is an anagram indicator.
'to capture' means one lot of letters goes inside another.
'heart' says to take the centre.
The central letter of 'his' is 'i'.
'in'+'france'='infrance'
'infrance' is an anagram of 'fnancier'.
'fnancier' enclosing 'i' is 'FINANCIER'.
(Other definitions for financier that I've seen before include "Money manager" , "One working with money" , "One dealing in big money" , "Manager of large-scale monetary resources" , "Person engaged in large money transactions" .)