Learned one ultimately insulting about Information Technology (7)
I believe the answer is:
erudite
'learned' is the definition.
(I know that learned can be written as erudite)
'one ultimately insulting about information technology' is the wordplay.
'ultimately' says to take the final letters.
'insulting' becomes 'rude' (rude can mean abusive or insulting).
'about' means one lot of letters goes inside another.
'information technology' becomes 'IT' (common abbreviation).
The final letter of 'one' is 'e'.
'rude' going around 'it' is 'rudite'.
'e'+'rudite'='ERUDITE'
(Other definitions for erudite that I've seen before include "Rue diet for the learned" , "Learned and literate" , "Having deep knowledge" , "Well educated, having great learning" , "Learned, well educated" .)