Open with a letter opener (4)

I believe the answer is:

slit

'open with a letter opener' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for slit that I've seen before include "Narrow rent" , "Narrow aperture" , "Long narrow cut" , "Narrow straight cut or opening" , "Long narrow opening" .)

I've seen this clue in the USA Today, the New York Times, the Newsday and the Newsday.com.

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