American and European mostly get on together (5)

I believe the answer is:
agree
'on together' is the definition.
I can't tell whether this definition defines the answer.
'american and european mostly' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'and' is a charade indicator (letters next to each other).
'european' becomes 'Greek ' (Greece is in Europe).
'mostly' means to remove the last letter (most but not all of the word).
'greek' with its final letter removed is 'gree'.
'a'+'gree'='AGREE'
'get' is the link.
Can you help me to learn more?
(Other definitions for agree that I've seen before include "share the same view" , "Say yes to a suggestion" , "chime?" , "Accept" , "Go along with" .)
