South American welcome for Japanese dish (5)
I believe the answer is:
sushi
'japanese dish' is the definition.
(type of Japanese food)
'south american welcome' is the wordplay.
'south' becomes 's' (abbreviation).
'american' becomes 'US' (United States).
'welcome' becomes 'hi' (both are greetings).
's'+'us'+'hi'='SUSHI'
'for' acts as a link.
(Other definitions for sushi that I've seen before include "Asian food" , "'Dish of rice, vegetables and raw fish (5)'" , "Cold rice balls with raw fish" , "Japanese food" , "put away in Japan" .)