Greek or Roman jar (7)
I believe the answer is:
amphora
'greek or roman jar' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for amphora that I've seen before include "piece of classical pottery" , "Ancient jar with two handles, for wine" , "wine-holder" , "Old jar with handles" , "Ancient Greek or Roman jar with two handles" .)