Soufflé ingredient (3)
I believe the answer is:
egg
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">souffle ingredient</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 egg that I've seen before include "Source" , "Food from a hen" , "Urge (someone on )" , "Bomb or mine (sl.)" , "Item of food" .)