Walk feebly (6)
I believe the answer is:
dodder
'walk feebly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dodder that I've seen before include "Progress unsteadily (due to age?)" , "Hesitate" , "Be slow and unsteady" , "move unsteadily" , "Be decrepit in the Dublin river" .)