Vintage coin found inside empty Eastbourne train (7)
I believe the answer is:
educate
'train' is the definition.
(synonyms)
'vintage coin found inside empty eastbourne' is the wordplay.
'vintage coin' becomes 'ducat' (historical gold coin).
'found inside' means one lot of letters goes inside another.
'empty' means to remove the middle letters.
'eastbourne' with its middle taken out is 'ee'.
'ducat' placed within 'ee' is 'EDUCATE'.
(Other definitions for educate that I've seen before include "School, train" , "Teach - instruct" , "teaching style" , "Teach - school" , "Train, teach" .)