Crossword Genius

Type of forest in Iran? (4)

Ross

I believe the answer is:

rain

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

This might be a double definition.

'type of forest' is the first definition.

'iran?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for rain that I've seen before include "Falling water" , "Fall in large quantities" , "Wet weather" , "downfall?" , "Storm" .)

I've seen this clue in the Evening Standard.
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