Learned European’s not educated about sex (7)
I believe the answer is:
erudite
'learned' is the definition.
(synonyms)
'european's not educated about sex' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'not educated' becomes 'rude' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'sex' becomes 'it' (a common euphemism).
'rude' enclosing 'it' is 'rudite'.
'e'+'rudite'='ERUDITE'
Can you help me to learn more?
(Other definitions for erudite that I've seen before include "Having deep knowledge" , "Showing profound knowledge" , "Rue diet for the learned" , "Learned, well educated" , "Possessing great learning" .)