American with avarice is of the same mind (6)
I believe the answer is:
agreed
'of the same mind' is the definition.
(of the same mind means in agreement)
'american with avarice' is the wordplay.
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'with' says to put letters next to each other.
'avarice' becomes 'greed' (synonyms).
'a'+'greed'='AGREED'
'is' is the link.
(Other definitions for agreed that I've seen before include "Shared an opinion" , "Was fitting" , "Let's do it!" , "Consented, settled" , "In harmony" .)