Bad priest, beginning to end (4)

I believe the answer is:

evil

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

'bad' is the definition.
(I know that evil is a type of bad)

I can't explain the rest of the clue.

(Other definitions for evil that I've seen before include "Morally bad" , "Excellent" , "Badness, depravity" , "Morally corrupt" , "Immorality" .)

I've seen this clue in The Guardian.

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