Lecturer is not practical (8)
I believe the answer is:
academic
'not practical' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for academic that I've seen before include "Not expected to produce any practical result" , "A person studying" , "Irrelevant; teacher" , "Scholar - of no practical importance" , "Scholarly as opposed to practical (8)" .)