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Clue: A very exacting business (5)
Answer: - S - R -
Could it be usury or usure?

Clue: Fancy work? (7)
Answer: - I - T - O -

Clue: Prevented from making a full report (7)
Answer: B - F - L - D

The first one is usury. Not sure about the second,and the third is baffled

Fiction would fit the missing clue

Sure about the B in your 3rd one? Muffled looks a possibilty otherwise.