Foreign money invested in sugar crop and pepper (7)
I believe the answer is:
cayenne
'pepper' is the definition.
(I know that cayenne is a type of pepper)
'foreign money invested in sugar crop' is the wordplay.
'foreign money' becomes 'yen' (Japanese currency).
'invested in' indicates putting letters inside.
'sugar crop' becomes 'cane' (I've seen this in another clue).
'yen' placed inside 'cane' is 'CAYENNE'.
'and' is the link.
(Other definitions for cayenne that I've seen before include "something spicy" , "Kind of pepper" , "Hot red spice" , "Capital of French Guinea" , "Variety of pepper" .)