Sea creatures with stinging tentacles (9)

I believe the answer is:

jellyfish

(Other definitions for jellyfish that I've seen before include "Marine creature with stinging tentacles" , "Medusa - weak, indecisive person" , "Marine stinger" , "Gelatinous sea animal with tentacles" , "Stinging coelenterate" .)

I've seen this clue in The Guardian.

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