Crossword clue: the aquatic larva of a large neuropterous insect (corydalus cornutus), used as bait in angling. see hellgamite.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait