Prophetic text in final letter going into East European port (7)
I believe the answer is:
ezekiel
'prophetic text' is the definition.
(book of the Old Testament)
'final letter going into east european port' is the wordplay.
'final letter' becomes 'Z' (in the alphabet).
'going into' is an insertion indicator.
'east european' becomes 'ee' (this could be a standard abbreviation which I don't know about).
'port' becomes 'Kiel' (Kiel is a port in Germany).
'z' inserted inside 'ee' is 'eze'.
'eze'+'kiel'='EZEKIEL'
'in' acts as a link.
(Other definitions for ezekiel that I've seen before include "Biblical prophet" , "Babylon-exile prophet" , "OT book, prophet, priest" , "Book of the Old Testament" , "Valley-of-bones prophet" .)