The most common and most likely answer to this crossword clue is the 4 letter word ROBE
I've seen this crossword clue in The Guardian
R
O
B
E
More clues leading to the result ROBE
- Short bloke has drug habit
- What to put on archbishop's back
- Republican given honour and ceremonial dress
- King putting medal on official dress
- King with honour producing garment
- Gown or doublet regularly chosen
- Dress in York lifted up
- When power’s cut search closely for gown
- Leader of investigation goes missing in dress
- It’s put on eggs bishop’s eaten
Buddy explains!

The straight part
We know that "It’s put on/It’s put on" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it’s put on/it’s put on = robe.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 ROBE mean?
ROBE 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.
- To clothe; to dress.
- To put on official vestments.