Crossword Genius

Type of jazz singing involving improvised vocal sounds (4)

Ross

I believe the answer is:

scat

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'type of jazz singing' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

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(Other definitions for scat that I've seen before include "One way of singing" , "Jazz-singing" , ""Beat It"" , "Shoo!" , "Leave; jazz singing" .)

I've seen this clue in The Times.
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