Caterpillar or tadpole, eg (5)
I believe the answer is:
larva
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">caterpillar</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">tadpole eg</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that tadpole is a type of larva)</span><br/ ><br/ ></span>
(Other definitions for larva that I've seen before include "Worm-like insect before metamorphosis" , "Immature form of caterpillar" , "Grub, caterpillar stage" , "Immature form of (insect) development" , "Caterpillar perhaps" .)