Investor first to support Tokyo, for example (10)
I believe the answer is:
capitalist
'investor' is the definition.
(thesaurus)
'first to support tokyo for example' is the wordplay.
'first' becomes 'ist'.
'to support' is a charade indicator (letters next to each other) (in a down clue, some letters hold others up).
'tokyo for example' becomes 'capital' (tokyo is a kind of capital).
'ist' after 'capital' is 'CAPITALIST'.
(Other definitions for capitalist that I've seen before include "businessperson, maybe" , "Marx's bourgeois - a static lip (anag)" , "rich man" , "Profit-driven person" , "Free enterprise supporter" .)