Former planet (5)
I believe the answer is:
pluto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">former planet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pluto that I've seen before include "animated dog" , "Ninth planet of solar system" , "that is submerged under water" , "Distant planet" , "Hollywood creation" .)