Monopoly token retired in 2013 (4)

I believe the answer is:

iron

'monopoly token retired in 2013' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for iron that I've seen before include "Metallic chemical element" , "Club to smooth the cloth" , "Decrease" , "Heavy metallic element" , "Smooth; element" .)

I've seen this clue in The Wall Street Journal.

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