Spelling expert corrected errors checking compliance with English (8)
I believe the answer is:
sorcerer
'spelling expert' is the definition.
(an expert at doing spells)
'corrected errors checking compliance with english' is the wordplay.
'corrected' indicates an anagram.
'checking' means one lot of letters goes inside another (check can mean to control or arrest).
'compliance' becomes 'c' (physics abbreviation).
'with' means one lot of letters goes inside another.
'english' becomes 'e' (abbreviation).
'errors' is an anagram of 'sorrer'.
'sorrer' placed around 'c' is 'sorcrer'.
'sorcrer' placed around 'e' is 'SORCERER'.
(Other definitions for sorcerer that I've seen before include "Necromancer or wizard" , "In stories, he has magical powers that he uses to harm others" , "Magician with musical apprentice" , "Potter, say" , "Male magician, wizard" .)