Stop camel running - that's spiritual stuff (9)
I believe the answer is:
ectoplasm
'spiritual stuff' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe there's an association between them I don't understand?
'stop camel running' is the wordplay.
'running' is an anagram indicator.
'stop'+'camel'='stopcamel'
'stopcamel' anagrammed gives 'ECTOPLASM'.
'that's' is the link.
Can you help me to learn more?
(Other definitions for ectoplasm that I've seen before include "Supposed material exuded by medium" , "Substance supposedly emanating from the body of a medium during trances" , "Supposed the matter" , "Medium's output" , "Substance given off during seance" .)