Crossword Genius

Catch or fastener (4)

Ross

I believe the answer is:

nail

I believe this is a double definition.

'catch' is the first definition.
(nail can mean to catch or arrest)

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

'or' acts as a link.

(Other definitions for nail that I've seen before include "Expose as a lie" , "Perfectly execute" , "metal fixture" , "Horny part of the digit" , "Fasten - detect and expose" .)

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