The Atlantic, for example (5)
I believe the answer is:
ocean
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the atlantic for example</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that Atlantic Ocean is a ocean)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ocean that I've seen before include "Large amount of water and" , "Large stretch of sea" , "Immense expanse or quantity" , "Vast sea" , "Large area of water" .)