Dress bishop with new mitre (6)

I believe the answer is:

betrim

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

'dress' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'bishop with new mitre' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'with' means one lot of letters go next to another.
'new' indicates an anagram.
'mitre' anagrammed gives 'etrim'.
'b'+'etrim'='BETRIM'

Can you help me to learn more?

(Another definition for betrim that I've seen is " deck".)

I've seen this clue in The Independent.

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.