Exemplar of neatness (3)

I believe the answer is:

'exemplar of neatness' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for pin that I've seen before include "Fasten; a security code" , "Debit-card number" , "Cashpoint code" , "Peg or nail" , "Flagged stick placed in golf hole" .)

I've seen this clue in The New York Times and the L.A. Times Daily.

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