Invents a new word for hard currency (5)

I believe the answer is:

coins

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for coins that I've seen before include "change" , "Metal money" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app