Greek cheese (4)
I believe the answer is:
feta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek cheese</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 feta that I've seen before include "White Greek cheese" , "White and salty goat or sheep cheese" , "10 down cheese" , "Salty Greek cheese" , "Greek dairy product" .)