More aching with cold inside, queen’s a charmer (8)
I believe the answer is:
sorcerer
'a charmer' is the definition.
(someone who does spells or charms)
'more aching with cold inside queen's' is the wordplay.
'more aching' becomes 'sorer' (sore means aching or painful).
'with' indicates putting letters inside.
'cold' becomes 'icy' (similar in meaning).
'inside' indicates the central letters.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
The central letter of 'icy' is 'c'.
'sorer' enclosing 'c' is 'sorcer'.
'sorcer'+'er'='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" , "Male magician, wizard" , "Magician aided by evil spirits" .)