Crossword Genius

Flute, lovely rhythm (6)

Ross

I believe the answer is:

groove

I believe this is a double definition.

'flute' is the first definition.
(thesaurus)

'lovely rhythm' is the second definition.
(groove can mean a musical rhythm)

(Other definitions for groove that I've seen before include "Established routine" , "Long shallow depression or routine" , "Long thin furrow" , "Gramophone record track" , "Long narrow depression - dance and/or play popular music" .)

I've seen this clue in The Guardian.
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