East European keeps old coin for train (7)
I believe the answer is:
educate
'train' is the definition.
(I know that train can be written as educate)
'east european keeps old coin' is the wordplay.
'east' becomes 'e' (synonyms).
'european' becomes 'E' (abbreviation e.g. EU).
'keeps' is an insertion indicator.
'old coin' becomes 'ducat' (I've seen this before).
'e'+'e'='ee'
'ee' enclosing 'ducat' is 'EDUCATE'.
'for' is the link.
(Other definitions for educate that I've seen before include "Inform" , "what teacher should do, to be effective" , "Teach - instruct" , "teaching style" , "Train, teach" .)