Rough sketch showing debauchery? On the contrary (7)

I believe the answer is:

ebauche

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'rough' is the definition.
(thesaurus)

'sketch showing debauchery? on the contrary' is the wordplay.
'EBAUCHE' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

I've seen this clue in The Independent.

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