Caterpillar or grub (5)
I believe the answer is:
larva
<span class="explanation-format__ClueExplanation">I believe this 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">grub</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that grub can be written as larva)</span><br/ ><br/ ></span>
(Other definitions for larva that I've seen before include "Manage" , "Maggots" , "Insect in the first post-egg stage of its life" , "Immature stage of an insect" , "Caterpillar perhaps" .)