Tentacled creature (7)
I believe the answer is:
octopus
'tentacled creature' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for octopus that I've seen before include "fairground ride" , "Eight-armed mollusc" , "Tentacled, shell-less mollusc" , "large, influential organization" , "Scoot up (anag.)" .)