Way to get height to pass over low plane (6)
I believe the answer is:
smooth
'plane' is the definition.
(smooth plane is a kind of plane)
'way to get height to pass over low' is the wordplay.
'way' becomes 's' (Compass direction - South).
'to get' means one lot of letters go next to another.
'height' becomes 'h' (abbreviation in geometry).
'to' says to put letters next to each other (I've seen this in other clues).
'pass over low' becomes 'moot' (I can't justify this - if you can you should believe this answer much more).
'h' after 'moot' is 'mooth'.
's'+'mooth' is 'SMOOTH'.
Can you help me to learn more?
(Other definitions for smooth that I've seen before include "Still" , "Free from roughness, bumps etc." , "Regular - without problems" , "Not rough or wrinkled" , "Level; suave" .)