Calm — ocean (7)
I believe the answer is:
pacific
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">calm</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">ocean</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that Pacific is a ocean)</span><br/ ><br/ ></span>
(Other definitions for pacific that I've seen before include "Peaceable" , "Large ocean" , "Non-combatant" , "steam locomotive?" , "Peacemaking" .)