Foremost of keen investors exploiting venture capital (4)
I believe the answer is:
kiev
'capital' is the definition.
(capital of Ukraine)
'foremost of keen investors exploiting venture' is the wordplay.
'foremost of' suggests taking the first letters.
The initial letters of 'keen investors exploiting venture' is 'KIEV'.
(Other definitions for kiev that I've seen before include "Ukraine's capital - way of cooking chicken" , "Capital city of the Ukraine" , "FC Dynamo/chicken ___" , "place in eastern Europe" , "Ukrainian capital" .)