Inferior planet (5)
I believe the answer is:
venus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inferior planet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Venus is an example)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for venus that I've seen before include "Brightest planet" , "not really a star" , "Roman goddess of love" , "Roman counterpart of Aphrodite" , "Evening star" .)