Shapeless mass
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shapeless mass</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 blob that I've seen before include "Something small, soft and round" , "Drop of thick liquid or viscous substance" , "Mark signifying nothing" , "Globule; round spot" , "Indistinct shape" .)