Two Americans receiving a lot of support? You can count on it (6)
I believe the answer is:
abacus
'count on it' is the definition.
(I've seen this before)
'two americans receiving a lot of support? you' is the wordplay.
'two americans' can mean two replacements for 'american'.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'american' becomes 'US' (abbreviation for United States).
'receiving' indicates putting letters inside.
'a lot of support? you' becomes 'bac' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'us'='aus'
'aus' going around 'bac' is 'ABACUS'.
'can' is the link.
Can you help me to learn more?
(Other definitions for abacus that I've seen before include "It will support the architrave" , "It might calculate" , "this adds up" , "Very early calculator" , "calculator needed" .)