Slow-moving mollusc (5)
I believe the answer is:
snail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slow-moving mollusc</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for snail that I've seen before include "Mollusc with coiled shell" , "Edible terrestrial mollusc" , "Not one of the fleet" , "Soft-bodied garden animal with shell" , "Slow-moving creature" .)