Crossword Genius

Infallible (9)

Ross

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9

4-4

'infallible' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for foolproof that I've seen before include "incapable of going wrong" , "Not liable to failure" , "Can't be misinterpreted, even by simpleton" , "Not admitting failure" , "sure to work" .)

I've seen this clue in The Guardian and the King Feature Syndicate.
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