Heel over; slant (4)
I believe the answer is:
tilt
This clue is a double definition.
'heel over' is the first definition.
(I've seen this before)
'slant' is the second definition.
(I know that slant can be written as tilt)
(Other definitions for tilt that I've seen before include "Slant - joust" , "Cause to slope or incline" , "Heel over" , "Joust; bias" , "Slight inclination" .)