Speller considered ‘nefarious’ - “N … repeat the word? Right … ends with S” (11)
I believe the answer is:
enchantress
'speller considered nefarious n repeat' is the definition.
I can't tell whether this definition defines the answer.
'word? right ends with s' is the wordplay.
'word?' becomes 'enchant' (I am not sure about this - if you are sure you should believe this answer much more).
'right' becomes 'r' (common abbreviation).
'ends with' means one lot of letters go next to another.
's' becomes 'ess' (I've seen this in another clue).
'enchant'+'r'+'ess'='ENCHANTRESS'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for enchantress that I've seen before include "Bewitching female" , "One casting spells" , "Witch" , "Female magician" , "Seducer" .)