Unerring (10)

I believe the answer is:

infallible

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

This is the entire clue.

(Other definitions for infallible that I've seen before include "Incapable of error" , "Always working" , "faultless" , "Unable to make a mistake" , "Always right" .)

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

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