German writer introducing German article about Old English (6)
I believe the answer is:
goethe
'german writer' is the definition.
(johann wolfgang von goethe)
'introducing german article about old english' is the wordplay.
'introducing' says to take the initial letters.
'article' becomes 'the' (the 'definite article' part of speech**).
'about' is a charade indicator (letters next to each other).
'old english' becomes 'oe'.
The first letter of 'german' is 'g'.
'the' put after 'oe' is 'oethe'.
'g'+'oethe'='GOETHE'
(Other definitions for goethe that I've seen before include "German poet, d. 1832" , "German playwright and poet" , "Poet's" , "Wolfgang von - , Faust author" , "German author (Faust)" .)