Horn of Plenty (10)
I believe the answer is:
cornucopia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horn of plenty</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 cornucopia that I've seen before include "mine" , "Horn of plenty" , "Wealth" , "Symbol of plenty" , "Abundant supply of good things" .)