Crossword Genius

Genuine error that’s serious by reported visionary (7)

Ross

I believe the answer is:

sincere

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'genuine' is the definition.
(sincere can mean authentic or genuine)

'error that's serious by reported visionary' is the wordplay.
'error' becomes 'sin' (a sin is a moral error).
'that's serious by reported visionary' becomes 'cere' (I can't explain this - if you can you should give a lot more credence to this answer).
'sin'+'cere'='SINCERE'

Can you help me to learn more?

(Other definitions for sincere that I've seen before include "Not hypocritical" , "straightforward" , "(Of person) genuine" , "Pure" , "Free from deception" .)

I've seen this clue in The Times.
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