Piggy bank addition (4)

I believe the answer is:

coin

'piggy bank addition' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for coin that I've seen before include "Metal currency" , "Invent a word or phrase - for money?" , "Mint" , "Metal used as money" , "stamp" .)

I've seen this clue in the Newsday and the LA Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.