Crossword Genius

Curvature hard to miss in cavern (6)

Ross

I believe the answer is:

camber

I'm a little stuck... Click here to teach me more about this clue!

'cavern' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for camber that I've seen before include "Curvature of aircraft wing" , "Curve given to surface as of road" , "may appear on road" , "bend in road" , "Slight convexity, like the surface of a road" .)

I've seen this clue in The Telegraph.
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