Pitch with the slippery slope perhaps? (5)
I believe the answer is:
slant
'slope perhaps?' is the definition.
(sloping is a kind of slanting)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for slant that I've seen before include "Deviation from the horizontal" , "It's at an angle to the horizontal" , "Angle; incline" , "passing breeze?" , "Viewpoint; slope" .)