The most common and most likely answer to this crossword clue is the 5 letter word ROBED
I've seen this crossword clue in Financial Times
R
O
B
E
D
More clues leading to the result ROBED
Buddy explains!

The straight part
We know that "clad like a judge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clad like a judge = robed.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 ROBED mean?
ROBED verb- To clothe; to dress.
- To put on official vestments.
- Wearing a robe.