Flippered animals (5)
I believe the answer is:
seals
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flippered animals</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 seals that I've seen before include "they're impressive" , "Animals spotted on coast" , "Fastens or closes securely" , "They make an impression" , "Marine mammals" .)