Moving ice mass (7)

I believe the answer is:

glacier

'moving ice mass' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for glacier that I've seen before include "One creeps downhill" , "Creeping ice mass" , "Mass of ice moving down a mountain" , "Slow-moving mass of ice" , "Slow-moving flow of ice" .)

I've seen this clue in The Sun.

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