Natural satellite (4)

I believe the answer is:
moon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">natural satellite</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 moon that I've seen before include "Shining ball of green cheese?" , "Show Bottom!" , "Satellite revolving round the earth" , "Remove boxers, maybe" , "crescent perhaps" .)