Discover line near turning (5)
I believe the answer is:
learn
'discover' is the definition.
(I know that discover can be written as learn)
'line near turning' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'turning' indicates an anagram.
'near' with letters rearranged gives 'earn'.
'l'+'earn'='LEARN'
(Other definitions for learn that I've seen before include "Con" , "what pupils do in schools" , "Be educated" , "Absorb as knowledge, from book or experience" , "Comprehend" .)