Quiet one eating American and Japanese food (5)
I believe the answer is:
sushi
'japanese food' is the definition.
(I've seen this before)
'quiet one eating american' is the wordplay.
'quiet' becomes 'sh'.
'one' becomes 'i' (Roman numeral).
'eating' indicates putting letters inside.
'american' becomes 'us'.
'sh'+'i'='shi'
'shi' going around 'us' is 'SUSHI'.
'and' is the link.
(Other definitions for sushi that I've seen before include "Fated" , "Japanese food" , "Japanese rice and raw fish dish" , "cold food" , "Exotic food" .)