Type of caviar (6)
I believe the answer is:
beluga
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">type of caviar</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 beluga that I've seen before include "fish" , "large marine creature" , "Large Russian sturgeon" , "Type of whale; sturgeon" , "Small northern white whale" .)