Shellfish from Yellow Sea exported to France (5)
I believe the answer is:
ormer
'shellfish' is the definition.
(ormer is a kind of shellfish)
'yellow sea exported to france' is the wordplay.
'yellow' becomes 'or' (heraldic term).
'sea exported to france' becomes 'mer' ('sea' in French).
'or'+'mer'='ORMER'
'from' acts as a link.
(Other definitions for ormer that I've seen before include "Delicacy from Channel Islands" , "seashell" , "Ear-shell" , "Seafood" , "Shellfish" .)