Manic preacher? Nobody's perfect (6,8)

I believe the answer is:

beyond reproach

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'perfect' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'manic preacher? nobody's' is the wordplay.
'manic' indicates an anagram (I've seen this in other clues).
'preacher'+'nobody'='preachernobody'
'preachernobody' with letters rearranged gives 'BEYOND REPROACH'.

Can you help me to learn more?

(Other definitions for beyond reproach that I've seen before include "Too good to be criticised" , "squeaky clean" , "not deserving censure" , "too good to be criticized" .)

I've seen this clue in the Sydney Morning Herald.

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