Largest of the Channel Islands (6)
I believe the answer is:
jersey
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">largest of the channel islands</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for jersey that I've seen before include "Light-brown dairy cattle" , "Woolly" , "farm animal" , "Cyclist's shirt" , "Supplier of dairy produce" .)