Inclined to back gloomy report (7)
I believe the answer is:
oblique
'inclined' is the definition.
(similar in meaning)
I can't explain the rest of the clue.
(Other definitions for oblique that I've seen before include "Angled" , "Indirect - devious" , "Backhanded" , "Sloping; roundabout" , "This angle is obtuse or acute" .)