Marine echinoderm (3,6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">marine echinoderm</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 sea urchin that I've seen before include "Marine invertebrate with spikes" , "Shelled marine creature" , "Marine life form" , "Marine creature with near-spherical spiny shell" , "Marine invertebrate - enrich USA (anag)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">marine echinoderm</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 starfish that I've seen before include "Astral aquatic animal" , "Well-armed customer" , "Has rifts (anag)" , "As swimmer" , "Heavenly marine animal?" .)