Bulletin board pin (4)

I believe the answer is:

tack

'bulletin board pin' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tack that I've seen before include "Stickiness" , "Nail; course of action" , "Nail; harness" , "Short, flat-headed nail" , "Fix with pins, shoddy material" .)

I've seen this clue in the USA Today and the Newsday.

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