Husky remains guarding one big bundle of nerves (5)
I believe the answer is:
brain
'husky remains' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for brain that I've seen before include "Clever type" , "The grey matter" , "Intellectual capacity" , "to get hit over the head" , "Intelligence" .)