Possible Clues:

• Pre-euro Greek currency
• Formerly the basic unit of money in Greece
• Former Greek currency unit
• Old brass check in work by 6
• Flip over king, say, and queen, perhaps on a now obsolete coin
• Psychiatrist gets Taoiseach finally to master what money was once in Greece
• The money outsiders from Corinth invested in play?
• Daughter has a charm made of six obols
• Currency replaced with a euro with an owl on its reverse
• Play about church once in circulation