Crossword Genius

Mail opening (4)

Ross

I believe the answer is:

slot

'mail opening' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for slot that I've seen before include "Lots (anag.)" , "Narrow opening as in gaming machine" , "Small opening, for a coin say" , "This gaming machine operates by insertion of coin" , "Hole for e.g. coin" .)

I've seen this clue in the Universal, The New York Times and the King Feature Syndicate.
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