Dish from South America -- hot one! (5)
I believe the answer is:
sushi
'dish' is the definition.
(sushi is a kind of dish)
'south america hot one' is the wordplay.
'south' becomes 's' ('S' can be a synonym of 'south').
'america' becomes 'us' (abbreviation for the United States).
'hot' becomes 'h'.
'one' becomes 'i' (Roman numeral).
's'+'us'+'h'+'i'='SUSHI'
'from' is the link.
(Other definitions for sushi that I've seen before include "'Dish of rice, vegetables and raw fish (5)'" , "Fated" , "rice dishes" , "Cold rice dish, often with raw fish" , "Japanese vinegared rice dish" .)