Crossword Genius

Deduce these connect outer edges in sensor (8)

Ross

I believe the answer is:

detector

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'sensor' is the definition.
(synonyms)

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(Other definitions for detector that I've seen before include "Electronic device" , "Device warning of, eg, smoke" , "Sensor" , "Device for monitoring hazards" .)

I've seen this clue in The Irish Times.
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