Crossword Genius

Continuos low background noise (6)

Ross

I believe the answer is:

murmur

(Other definitions for murmur that I've seen before include "Quietly spoken utterance; heart defect" , "Mumbled expression of malcontent" , "Low, indistinct speech" , "Low background noise" , "Mumble" .)

I've seen this clue in The Guardian.
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