Hard fruit (3)
I believe the answer is:
nut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hard fruit</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 nut that I've seen before include "Large, hard-shelled seed" , "Hazel; beech" , "needing to get tight?" , "Somebody obsessed" , "buff" .)