Mass of ice (7)

I believe the answer is:

glacier

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

This is all the clue.

(Other definitions for glacier that I've seen before include "Moving body of ice" , "Mass of ice moving down a mountain" , "Large flow of ice" , "Flowing ice sheet" , "Slowly moving mass of ice" .)

I've seen this clue in The Independent.

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