This coin is ancient, I say (6)
I believe the answer is:
stater
This might be a double definition.
'this coin is ancient' is the first definition.
'stater' can be an answer for 'coin' (ancient coin). I'm not certain of the rest of the definition.
'i say' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for stater that I've seen before include "He says" , "Old Greek coin" , "One saying something" , "Greek currency as earlier" , "I say" .)