Frat jewelry (3)

I believe the answer is:

'frat jewelry' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for pin that I've seen before include "Skittle; chess attack" , "Needle" , "Hold (down)" , "Secure" , "Peg or nail" .)

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

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