Small toothed whale (7)
I believe the answer is:
dolphin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small toothed whale</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 dolphin that I've seen before include "member in school" , "Snall type of whale" , "Bottlenose creature?" , "Sea-mammal" , "Sociable sea mammal, sacred in ancient Greece" .)