Fingertip fastener (4)

I believe the answer is:

nail

I believe this is a double definition.

'fingertip' is the first definition.
(I've seen this in another clue)

'fastener' is the second definition.
(I know that nail is a type of fastener)

(Other definitions for nail that I've seen before include "Hammered pin" , "Hammered individual" , "Metal pin, hit it on the head" , "Catch - fastener" , "Finger end; fasten" .)

I've seen this clue in The Globe and Mail.

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