Granny Smith, for one
I believe the answer is:
apple
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">granny smith for one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(granny smith is a kind of apple)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for apple that I've seen before include "eg Cox, Bramley" , "Pipped fruit" , "Jonathan, for example" , "Eg, Bramley, Braeburn" , "Fruit of the rose family" .)