Crossword Genius

Flowers (gradually) appearing in cold regions (8)

Ross

I believe the answer is:

glaciers

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This clue could be a double definition.

'flowers' is the first definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

'gradually appearing in cold regions' is the second definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for glaciers that I've seen before include "Slowly moving ice-masses" , "Slowly moving masses of ice" , "Ice flows" , "Slow-moving masses of ice" , "Slow-moving ice-masses" .)

I've seen this clue in The Independent.
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