Great abundance (10)
I believe the answer is:
cornucopia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">great abundance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cornucopia that I've seen before include "Abundant supply of good things" , "mine" , "Symbol of plenty" , "Horn of plenty" , "There's plenty here!" .)