Lemon or apple (5)
I believe the answer is:
fruit
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lemon</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">apple</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for fruit that I've seen before include "Kiwi, mandarin etc" , "Greengrocer's produce" , "Result - food" , "Seed-bearing growth" , "Eg, apple or pear" .)