Sumptuously rich (6)
I believe the answer is:
lavish
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sumptuously rich</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 lavish that I've seen before include "Plentiful, generous" , "Unstinting" , "Plentiful or munificent" , "Luxurious" , "Profusely generous" .)