Crossword Genius

Hum and haw (6)

Ross

I believe the answer is:

falter

'hum and haw' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for falter that I've seen before include "Hesitate, begin to give way" , "Hesitate, be uncertain" , "Hesitate, waver" , "Be hesitant" , "Lose momentum" .)

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