One of two in a split (3)

I believe the answer is:

'one of two in a split' 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 "Cashpoint code" , "Skittle; fix" , "Number allocated for electronic transactions" , "Small object to fasten or attach" , "Small pointed metal fastener" .)

I've seen this clue in The Chronicle of Higher Education and the USA Today.

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