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Determine the accuracy of bacterial infection (9)

Ross

I believe the answer is:

calibrate

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'determine' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.

'the accuracy of bacterial infection' is the wordplay.
'bacterial' can be anagrammed to 'CALIBRATE'.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for calibrate that I've seen before include "Mark (a gauge) with a scale of readings" , "Mark the scale of a measuring instrument" , "judge factors in readings" , "Mark a scale to use in taking readings" , "Mark positions" .)

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