Dazed and unsteady (6)
I believe the answer is:
groggy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dazed and unsteady</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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?" .)