Merchant ship from Greek city coming to journey's end (6)
I believe the answer is:
argosy
'merchant ship' is the definition.
(I've seen this before)
'greek city coming to journey's end' is the wordplay.
'greek city' becomes 'argos'.
'coming to' means one lot of letters go next to another.
'end' says to take the final letters.
The last letter of 'journey' is 'y'.
'argos'+'y'='ARGOSY'
'from' is the link.
(Other definitions for argosy that I've seen before include "Old merchant ship" , "merchant fleet" , "Great merchant ship" , "craft" , "Ancient merchant ship" .)