ATM entry (3)

I believe the answer is:

'atm entry' 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 "Cashpoint code" , "Flagged stick placed in golf hole" , "Fixing device" , "Number allocated for electronic transactions" , "Debit-card number" .)

I've seen this clue in the Universal and The Wall Street Journal.

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