Crossword Genius

Narrow aperture (4)

Ross

I think it could be either:

slot

slit

'narrow aperture' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for slot that I've seen before include "Long narrow aperture" , "This gaming machine operates by insertion of coin" , "Scheduled time -- aperture for coins" , "Space for inserting coin" , "Long narrow slit" .)

I've seen this clue in the Sydney Morning Herald and The Mirror.
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