Crossword Genius

This could be shaping how an area is mostly dry (4,6)

Ross

I believe the answer is:

rain shadow

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


If this is the answer I cannot explain how the clue works.

Can you help me to learn more?

(Other definitions for rain shadow that I've seen before include "Relatively dry region in shelter of hills" , "Place less damp" , "area kept drier by hills?" .)

I've seen this clue in The Times and The Sunday Times.
Want a hint initially instead of a full solution? Install my app