They don't believe he requires foreign capital (8)
I believe the answer is:
heathens
'they don't believe' is the definition.
(I've seen this before)
'he requires foreign capital' is the wordplay.
'requires' means one lot of letters go next to another.
'foreign capital' becomes 'athens' (capital of Greece. I am not sure about the 'foreign' bit.).
'he'+'athens'='HEATHENS'
Can you help me to learn more?
(Other definitions for heathens that I've seen before include "They don't believe in any of the major religions" , "pagans" , "Athens he searched for non-believers" , "Those who do not believe in the main religions" .)