Careless characters in Peru tear a hole (8)

I believe the answer is:

aperture

I'm a little stuck... Click here to teach me more about this clue!

'hole' is the definition.
(aperture is a kind of hole)

'careless characters in peru tear a' is the wordplay.
'peru tear' anagrams to 'APERTURE'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for aperture that I've seen before include "Opening, gap" , "Opening through which light enters a camera" , "Opening (on camera, for example)" , "An opening that admits light" , "Narrow opening" .)

I've seen this clue in The Irish Times.

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