Walk pompously (5)
I believe the answer is:
strut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">walk pompously</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 strut that I've seen before include "Rigid support" , "swaggering gait" , "(Walk with) a stiff pompous gait" , "Vain walk" , "supporter" .)