Indirect slanting (7)
I believe the answer is:
oblique
This clue is a double definition.
'indirect' is the first definition.
(similar in meaning)
'slanting' is the second definition.
(I've seen this before)
(Other definitions for oblique that I've seen before include "Angled" , "Indirect - devious" , "Sloping; roundabout" , "This angle is obtuse or acute" , "Backhanded" .)