Crossword Genius

Measure in decibel levels (3)

Ross

I believe the answer is:

ell

'measure' is the definition.
(historical unit of length)

'in decibel levels' is the wordplay.
'in' indicates a hidden word.
'ELL' is hidden in the letters of 'decibel levels'.

(Other definitions for ell that I've seen before include "distance" , "Once, forty-five inches" , "Old measure equivalent to about 45 inches in England" , "Embellish with old measure of length" , "Old 45-inch measure" .)

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