Insect's adult stage (5)
I believe the answer is:
imago
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">insect's adult stage</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for imago that I've seen before include "idealised figure" , "Last stage of insect's development" , "Final stage of insect development" , "Perhaps butterfly" , "imagines more than one" .)