Nervous wreck of Spooner's coffin supporter (6,4)
I believe the answer is:
basket case
'nervous wreck' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for basket case that I've seen before include "Person unable to function properly" , "A nervous wreck" , "Very poor country" , "hopeless type" , "economically weak country" .)