Tentacled sea creature (5)
I believe the answer is:
squid
'tentacled sea creature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for squid that I've seen before include "Item of seafood" , "Tentacled marine creature" , "Calamari" , "Marine cephalopod" , "Ten-armed mollusc" .)