Hazel nut (7)
I believe the answer is:
filbert
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hazel nut</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 filbert that I've seen before include "Hazel nut" , "Nut -- left rib (anag)" , "Type of hazelnut" .)