One's scrupulous editor under pressure with a set of books (6)
I believe the answer is:
pedant
'one's scrupulous' is the definition.
I can't judge whether this definition defines the answer.
'editor under pressure with a set of books' is the wordplay.
'editor' becomes 'ed' (abbreviation).
'under' means one lot of letters go next to another.
'pressure' becomes 'p' (abbreviation).
'with' is a charade indicator (letters next to each other).
'set of books' becomes 'NT' (New Testament).
'ed' put after 'p' is 'ped'.
'ped'+'a'+'nt'='PEDANT'
Can you help me to learn more?
(Other definitions for pedant that I've seen before include "Panted like stickler for accuracy" , "Pentad (anag.)" , "One excessively concerned with minor detail" , "Fussy schoolmaster, academic" , "Person who pays too much attention to formal rules" .)