Language papers and course taken by day's end (7)
I believe the answer is:
yiddish
'language' is the definition.
(Yiddish is an example)
'papers and course taken by day's end' is the wordplay.
'papers' becomes 'id' (identification papers).
'and' says to put letters next to each other.
'course' becomes 'dish' (I've seen this before).
'taken by' is a charade indicator (letters next to each other).
'day's end' becomes 'y' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'id'+'dish' is 'iddish'.
'iddish' after 'y' is 'YIDDISH'.
Can you help me to learn more?
(Other definitions for yiddish that I've seen before include "German dialect widely used by European Jews before the Holocaust" , "Dishy Di (anag.)" , "Vernacular Jewish language" , "German-based Jewish language" , "Nosh, for example" .)