Returning American sorted his fare from Japan (5)
I believe the answer is:
sushi
'fare from japan' is the definition.
(I've seen this before)
'returning american sorted his' is the wordplay.
'returning' shows that the letters should be reversed in order.
'american' becomes 'us'.
'sorted' indicates anagramming the letters.
'us' written backwards gives 'su'.
'his' anagrammed gives 'shi'.
'su'+'shi'='SUSHI'
(Other definitions for sushi that I've seen before include "Asian food" , "Japanese food" , "Raw fish dishes" , "Fated" , "Japanese vinegared rice dish" .)