A fertile spot in a desert (5)
I believe the answer is:
oasis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a fertile spot in a desert</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 oasis that I've seen before include "retreat" , "Famous group" , "Desert sanctuary" , "place of relief" , "Peaceful area away from trouble" .)