Guardian 23000

Okay, I've completed it - rare for me with Paul - but I still can't
understand this one. Any takers?

March sunny? Not entirely - diabolical (7)

Solution:
QRZBAVP

Obviously the definition works, but I can't see the cryptic at all. While
I'm at it, from another clue, why would 'accepted' mean the letter E?

Danny

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