Eg, Jersey (6)
I believe the answer is:
island
'eg jersey' is the definition.
(I know that Jersey is a island)
This is the entire clue.
(Other definitions for island that I've seen before include "6 Across, for example" , "Eg, Crete" , "Land mass enclosed by water" , "Piece of land smaller than a continent" , "Such as Crete, say" .)