Story provided by the Schubertian songs (6)
I believe the answer is:
lieder
'songs' is the definition.
(lied is a kind of song)
'story provided by the schubertian' is the wordplay.
'story' becomes 'lie' (I've seen this before).
'provided by' says to put letters next to each other.
'the schubertian' becomes 'der' (I am not sure about this - if you are sure you should believe this answer much more).
'lie'+'der'='LIEDER'
Can you help me to learn more?
(Other definitions for lieder that I've seen before include "Vocal works" , "German songs of the Romantic period" , "songs by Schumann?" , "Relied on German song genre" , "[COMPOSITION] s" .)