Crossword Genius

Arm-like appendage of an invertebrate (8)

Ross

I believe the answer is:

tentacle

(Other definitions for tentacle that I've seen before include "Organ used for grasping and feeding" , "One may be feeling" , "Long flexible feeler" , "flexible arm?" , "Part of octopus" .)

I've seen this clue in the Sydney Morning Herald.
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