Dizzy and unsteady on the feet (6)
I believe the answer is:
groggy
'dizzy and unsteady on the feet' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for groggy that I've seen before include "In a daze" , "spaced out" , "Confused and slow to react" , "Dizzy and unsteady on the feet" , "Stunned, slow to react" .)