Good article about old English author who wrote in German (6)
I believe the answer is:
goethe
'author who wrote in german' is the definition.
(Johann Wolfgang von Goethe)
'good article about old english' is the wordplay.
'good' becomes 'g' (abbreviation).
'article' becomes 'the' (the 'definite article' part of speech).
'about' means one lot of letters go next to another.
'old english' becomes 'oe'.
'the' after 'oe' is 'oethe'.
'g'+'oethe'='GOETHE'
(Other definitions for goethe that I've seen before include "Johann Wolfgang von -, German dramatist" , "Eighteenth to nineteenth century German poet and dramatist (Faust)" , "Poet's" , "The ego, strangely, of the German writer" , "German writer, b 1749" .)