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According to locals, stupid radar never reveals them (4)

Ross

I believe the answer is:

darn

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'according to' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'locals stupid radar never reveals them' is the wordplay.
'DARN' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for darn that I've seen before include "Blow" , "Repair by sewing, socks perhaps" , "Mend with wool using needles" , "Mend a hole in a sock" , "Mend with 17s - mild expletive" .)

I've seen this clue in The Irish Times.
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