A French minister, upset, about to contradict atheist (10)

I believe the answer is:

unbeliever

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'atheist' is the definition.
(I've seen this before)

'a french minister upset about to contradict' is the wordplay.
'a french' becomes 'un' ('a' in French).
'minister upset about' becomes 'ver' (I can't explain this - if you can you should believe this answer much more).
'to' means one lot of letters go next to another (I've seen this in other clues).
'contradict' becomes 'belie' (synonyms).
'ver' after 'belie' is 'believer'.
'un'+'believer'='UNBELIEVER'

Can you help me to learn more?

(Another definition for unbeliever that I've seen is " atheist".)

I've seen this clue in The Times.

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