Pseudoscientist’s revolutionary mark in a register (9)
I believe the answer is:
alchemist
'pseudoscientist's' is the definition.
I can't judge whether this definition defines the answer.
'revolutionary mark in a register' is the wordplay.
'revolutionary' becomes 'Che' (Che Guevara).
'mark' becomes 'm'.
'in' indicates putting letters inside.
'register' becomes 'list' (listing is a kind of registering).
'che'+'m'='chem'
'a'+'list'='alist'
'chem' inserted inside 'alist' is 'ALCHEMIST'.
Can you help me to learn more?
(Other definitions for alchemist that I've seen before include "Seeker after gold" , "... seeker after stone" , "St Michael in role of one turning base metal into gold" , "Early experimenter" , "he sought a panacea" .)