Art of French victory being on time (9)

I believe the answer is:

decoupage

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'art' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'of french victory being on time' is the wordplay.
'of french' becomes 'de' ('of' in French).
'victory being' becomes 'coup' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'time' becomes 'age' (an age is a period of time).
'de'+'coup'+'age'='DECOUPAGE'

Can you help me to learn more?

(Another definition for decoupage that I've seen is " paperwork, perhaps".)

I've seen this clue in The Daily Express.

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