Sounds of hesitation (3)

I think it could be either:

ums

ers

'sounds of hesitation' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for ers that I've seen is " Bitter vetch".)

I've seen this clue in The New York Times, the LA Times, the King Feature Syndicate and The Wall Street Journal.

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