Bad advanced Bishop advanced (6)

I believe the answer is:

addled

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'bad' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'advanced bishop advanced' is the wordplay.
'advanced' becomes 'a' (abbreviation).
'bishop' becomes 'DD' (DD stands for Doctor of Divinity).
'advanced' becomes 'led' (I can't justify this - if you can you should believe this answer much more).
'a'+'dd'+'led'='ADDLED'

Can you help me to learn more?

(Other definitions for addled that I've seen before include "Gone bad (of eggs)" , "Rotten; muddled" , "Confused like infertile egg" , "mixed-up" , "Of egg, rotten and producing no chick" .)

I've seen this clue in The Telegraph.

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