Taught English journalist about old European coin (8)
I believe the answer is:
educated
'taught' is the definition.
(educating is a kind of teaching)
'english journalist about old european coin' is the wordplay.
'english' becomes 'e' (abbreviation).
'journalist' becomes 'ed' (short for editor).
'about' is a charade indicator (letters next to each other).
'old european coin' becomes 'ducat' (historical type of coin).
'ed' after 'ducat' is 'ducated'.
'e'+'ducated'='EDUCATED'
(Other definitions for educated that I've seen before include "Erudite" , "Learned - cultivated" , "Having completed schooling, well informed" , "Trained; learned" , "Schooled, trained" .)