Sterile (6)
I believe the answer is:
barren
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sterile</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 barren that I've seen before include "Infertile, unable to grow things" , "Bare and bleak" , "Empty" , "Sterile" , "Arid, infertile" .)