Bun spice (8)
I believe the answer is:
cinnamon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bun spice</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cinnamon that I've seen before include "Spice from dried bark" , "Spicy bark" , "spicy stuff" , "Aromatic tree bark used as a spice" , "Yellow-brown spice from bark of Asian tree" .)