Immature insect form (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">immature insect form</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for larva that I've seen before include "Immature form of an insect before metamorphosis" , "Woodworm" , "a developmental stage" , "Wriggler" , "Grub of e.g. beetle" .)
(Other definitions for nymph that I've seen before include "Sprite" , "Young locust" , "Echo possibly" , "Immature form of an insect" , "Echo, perhaps" .)