An exclusive thing to do with new bread (5)

I believe the answer is:

debar

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

'an exclusive thing to do' is the definition.
I can't judge whether this definition defines the answer.

'new bread' is the wordplay.
'new' indicates an anagram.
'bread' is an anagram of 'DEBAR'.

'with' is the link.

Can you help me to learn more?

(Other definitions for debar that I've seen before include "Blackball" , "Block" , "Keep out" , "Exclude - bread (anag)" , "Large advert" .)

I've seen this clue in the Evening Standard.

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