Adorn, festoon (6)
I believe the answer is:
bedeck
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">adorn</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(bedecking is a kind of adorning)</span><br/ ><br/ >'<span class="explanation-format__original">festoon</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for bedeck that I've seen before include "Adorn, embellish" , "Trim" , "Festoon; decorate" , "Embellish with adornments" , "Festoon, adorn" .)