Rich type of biscuit (9)
I believe the answer is:
shortcake
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rich type of biscuit</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 shortcake that I've seen before include "Rate shock (anag)" , "Dessert from America" , "Rich biscuit; American dessert" , "pastry?" , "Crisp, rich, crumbly, buttery biscuit" .)