Long-legged crustacean (6,4)
I believe the answer is:
spider crab
'long-legged crustacean' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spider crab that I've seen before include "little creature" , "shellfish" , "Type of crustacean" , "Aquatic creature" , "Crustacean with long thin legs" .)