Money invested in Moscow perhaps (7)
I believe the answer is:
capital
I believe this clue is a double definition.
'money invested' is the first definition.
(I've seen this before)
'moscow perhaps' is the second definition.
(moscow is a kind of capital)
'in' is the link.
(Other definitions for capital that I've seen before include "Wellington, say" , "Principal city" , "Money saved or invested - seat of government" , "A great city - that's fine" , "Means" .)