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1. Bringing about a lowering of French classification.[9]?E?R?????
2. Painting in brown material is checked.[6]
3. Patience that gives a certain range of latitude.[9]
4. This clue is appropriate to the subject.[9]
He is involved in dubious act.[5]C????

2. t art an
5 c he at

3 tolerance

Thank you sudokulover.

De )of French) + grading = degrading?

4 Long shot - crossword?

Thanks ab.