The way of a planet (7)
I believe the answer is:
ellipse
This clue could be a double definition.
'the way' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'a planet' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'of' is the link.
Can you help me to learn more?
(Other definitions for ellipse that I've seen before include "Egg-shaped geometrical figure" , "Conic section" , "Sell pie badly to get a geometrical figure" , "Sell pie off for a geometric figure" , "Inclined plane through a cone" .)