Ancient Greek coin (4)
![Ross](/clue/static/ross-mug.min.png)
'ancient greek coin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for obol that I've seen before include "bit of Ancient Greece" , "Old Greek coin" , "Jargon, slang" , "Old bit of lucre" , "Ancient Greek coin, six to the drachma" .)
(Other definitions for stater that I've seen before include "One expressing clearly; ancient Greek coin" , "One saying something" , "making declaration?" , "One specifying" , "Greek currency as earlier" .)