Dither, waver (8)
I believe the answer is:
hesitate
I believe this is a double definition.
'dither' is the first definition.
(I've seen this before)
'waver' is the second definition.
(I know that waver can be written as hesitate)
(Other definitions for hesitate that I've seen before include "Arrangements of units that function together" , "Show reluctance" , "Pause in indecision" , "'Pause, dither (8)'" , "To do so is to be lost, they say" .)