Extract from section one the lesson, in spite of that (11)
I believe the answer is:
nonetheless
'in spite of that' is the definition.
(I've seen this before)
'extract from section one the lesson' is the wordplay.
'extract from' indicates the answer is hidden within the clue (I've seen this in other clues).
'NONETHELESS' is hidden in the letters of 'section one the lesson'.
(Other definitions for nonetheless that I've seen before include "Despite that" , "In spite of that" , "Notwithstanding" , "However" , "in spit of that" .)