The largest of the Channel Islands (6)
I believe the answer is:
jersey
'the largest of the channel islands' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for jersey that I've seen before include "farm animal" , "Island, cow and knitted jumper" , "Woolly" , "Largest of the Channel Islands" , "Pullover; an island" .)