Metamorphosis stage (5)
I believe the answer is:
larva
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">metamorphosis stage</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 larva that I've seen before include "Animal in immature state" , "Insect just out of egg" , "Early stage of creature" , "Volcanic outpouring" , "Immature form of an insect before metamorphosis" .)