Dazed and unsteady (6)
I believe the answer is:
groggy
'dazed and unsteady' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for groggy that I've seen before include "Stunned and unsteady" , "'Dizzy, weak on the feet (6)'" , "spaced out" , "Dizzy, slow on the feet" , "Weak and unsteady - after rum and water?" .)