Answer:

umm

Answer	Crossword Clue
UMM	"Well ... er ..."
UMM	"Now let me think"
UMM	Protracted sound from the undecided

UMM	Deliberator's sound
UMM	Steak-...
UMM	"Er-r ..."
UMM	Steak- -- (brand of thinly sliced frozen beef)
UMM	Steak- -- (frozen beef brand)
UMM	"You're probably not gonna like this, but ..."