The most common and most likely answer to this crossword clue is the 8 letter word BEDECKED
I've seen this crossword clue in Financial Times
B
E
D
E
C
K
E
D
Buddy explains!
The straight part
We know that "Robed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case robed = bedecked.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BEDECKED mean?
BEDECKED verb- To deck, ornament, or adorn; to grace.
- Covered; encrusted; arrayed.