Wienie, perhaps from America, devoured by expert (7)
I believe the answer is:
sausage
'wienie perhaps' is the definition.
'america devoured by expert' is the wordplay.
'america' becomes 'usa' ('U.S.A.' can be a synonym of 'america').
'devoured by' is an insertion indicator.
'expert' becomes 'sage'.
'usa' put within 'sage' is 'SAUSAGE'.
'from' is the link.
(Other definitions for sausage that I've seen before include "Eg, salami or pepperoni" , "Chipolata, for example" , "Part of a hot dog" , "that should be edible" , "sort of roll?" .)