Lavishly decorate (6)
I believe the answer is:
bedeck
'lavishly decorate' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bedeck that I've seen before include "Adorn, cover with decorations" , "Trim" , "Adorn, embellish" , "Festoon; decorate" , "dress" .)