The most common and most likely answer to this crossword clue is the 5 letter word ROBES
R
O
B
E
S
More clues leading to the result ROBES
- King meets honoured people in ceremonial garb
- Taking leave in the end, Boris unexpectedly not one for trappings of office?
- Raiment often being exhibited with state openings
- Sweetheart wearing sacks for dresses
- Sort of sober attire for a judge
- Dresses up secretly in Chinese bordello
- On inhaling drug, steals garments
- Vatican city's new center: bishop goes there for clothes
Buddy explains!

The straight part
We know that "trappings of office" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trappings of office = robes.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 ROBES mean?
ROBES noun- A long loose outer garment, often signifying honorary stature.
- The skin of an animal, especially the bison, dressed with the fur on, and used as a wrap.
- A wardrobe, especially one built into a bedroom.
- The largest and strongest tobacco leaves.