Focusing cash primarily on helping to support change in America (13)
I believe the answer is:
concentration
'focusing' is the definition.
(thesaurus)
'helping to support change in america' is the wordplay.
'helping' becomes 'ration' (a ration is a serving or helping).
'to support' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'change in america' becomes 'concent' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ration' after 'concent' is 'CONCENTRATION'.
'cash primarily on' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for concentration that I've seen before include "A close gathering of things" , "relative amount put in to get solution?" , "Absorption" , "Application" , "A close gathering; mental focus" .)