Slow-moving mass of ice (7)

I believe the answer is:

glacier

'slow-moving mass of ice' 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" , "River of ice" , "Immense, slow-moving body of ice" , "Slowly moving mass of ice" , "Slow-moving mass of ice" .)

I've seen this clue in The Irish Times and The Daily Mail.

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