Archbishop's costume on show at Sadler's Wells (4)

I believe the answer is:

tutu

I'm a little stuck... Click here to teach me more about this clue!

'archbishop's' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for tutu that I've seen before include "The old primate" , "In which dancer may appear" , "very short garment" , "Ballet dancer's short skirt" , "Ballet-dancer's skirt" .)

I've seen this clue in The Daily Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.