Waver, be indecisive (6)
I believe the answer is:
dither
I believe this clue is a double definition.
'waver' is the first definition.
(I've seen this before)
'be indecisive' is the second definition.
(to dither is to avoid making a decision)
(Other definitions for dither that I've seen before include "Waver, be indecisive" , "quake" , "Be in two minds" , "'Vacillate, hesitate (6)'" , "Tremble - be undecided" .)