Back of a brooch (3)

I believe the answer is:

(Other definitions for pin that I've seen before include "Small object to fasten or attach" , "Flagged stick placed in golf hole" , "Debit-card number" , "Number allocated for electronic transactions" , "Stick with flag placed in golf hole" .)

I've seen this clue in the Newsday and the Newsday.com.

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