ATM ID (3)

I believe the answer is:

'atm id' 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 "Sewer's aid" , "form of identification" , "Fastener; brooch" , "Small brooch; skittle" , "Flagged stick placed in golf hole" .)

I've seen this clue in the Newsday.

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