Pro-Americans starting meetings (4)
I believe the answer is:
fora
'meetings' is the definition.
(forum is a kind of meeting)
'pro-americans starting' is the wordplay.
'pro' becomes 'for' (I've seen this before).
'starting' indicates taking the first letters.
The initial letter of 'americans' is 'a'.
'for'+'a'='FORA'
(Other definitions for fora that I've seen before include "Discussion meetings" , "discussions here" , "markets in Rome" , "Roman public squares" , "Areas of discussion" .)