Lavishly decorate (6)
I believe the answer is:
bedeck
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lavishly decorate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bedeck that I've seen before include "Adorn, cover with decorations" , "Trim" , "Adorn, embellish" , "Festoon; decorate" , "dress" .)