Little point in security number? (3)

I believe the answer is:

I believe this clue is a double definition.

'little point' is the first definition.
(a small sharp point)

'security number?' is the second definition.
(a PIN number - personal identification number)

'in' is the link.

(Other definitions for pin that I've seen before include "Number allocated for electronic transactions" , "Fixing device" , "Fastener; brooch" , "Badge" , "Peg or nail" .)

I've seen this clue in The Times.

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