Coat in Corfu redundant (3)
I believe the answer is:
fur
'coat' is the definition.
(fur coat is a kind of coat)
'in corfu redundant' is the wordplay.
'in' indicates the answer is hidden within the clue.
'FUR' is hidden within 'corfu redundant'.
(Other definitions for fur that I've seen before include "Animal skin like mink or sable" , "I may fly" , "eg Cat's coat" , "Eg, sable or ermine" , "Deposit lining kettles" .)