A classic charmer who, for me, is less than ideal (5)
I believe the answer is:
medea
'a classic charmer' is the definition.
'Medea' can be an answer for 'charmer' (thesaurus). I'm unsure of the 'a classic' bit.
'who for me is less than ideal' is the wordplay.
'who' becomes 'de' (I am not sure about this - if you are sure you should believe this answer much more).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'is less than' means to remove the last letter (not the full word).
'ideal' becomes 'ai' (resembles 'Ad', slang for excellent).
'ai' with its last letter removed is 'a'.
'de' put after 'me' is 'mede'.
'mede'+'a'='MEDEA'
Can you help me to learn more?
(Other definitions for medea that I've seen before include "In Greek myth, Jason's wife who killed their children in jealous rage" , "Mythical enchantress" , "Jason's sorceress" , "Tragedy by Euripides" , "Greek sorceress" .)