Crabby types, drunkenly egocentric in speech (9)
I believe the answer is:
shellfish
'speech' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for shellfish that I've seen before include "Category of seafood" , "Lobsters, cockles, mussels etc" , "Oysters, cockles, mussels etc" , "Crustaceans" , "A shrimp, maybe" .)