Wavers (7)
'wavers' is the definition.
(I know this)
This is the entire clue.
(Other definitions for falters that I've seen before include "'Loses confidence, begins to fail (7)'" , "Moves unsteadily, stumbles" , "Stumbles, hesitates" .)
(Other definitions for dithers that I've seen before include "Hesitates indecisively" , "Flaps, wavers" .)