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Measurement in a communic­ations circuit one person has installed (5)

Ross

I believe the answer is:

neper

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'measurement in a communications' is the definition.
The definition suggests a singular noun which matches the answer.

'circuit one person has installed' is the wordplay.
'has installed' says the answer is hidden in the clue (the answer is installed or held within the clue).
'NEPER' is hidden within 'circuit one person'.

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(Another definition for neper that I've seen is " Ratio unit of quantities".)

I've seen this clue in The Guardian.
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