Large landmass (7)
I believe the answer is:
eurasia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large landmass</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eurasia that I've seen before include "Supercontinent" , "Large landmass combining two continents" , "Largest landmass" , "Continental land mass" , "Unbroken landmass bearing two continents" .)