Believers back from America? (6)
I believe the answer is:
hindus
'believers' is the definition.
(believers in Hinduism)
'back from america?' is the wordplay.
'back' becomes 'hind' (synonyms).
'from america?' becomes 'US' (United States).
'hind'+'us'='HINDUS'
(Other definitions for hindus that I've seen before include "Followers of a major religion of South Asia" , "Asians with faith" , "Members of great religion in India" , "Religious people" , "Members of great Indian religion" .)