Large mass of floating ice (7)

I believe the answer is:

iceberg

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

This is the entire clue.

(Other definitions for iceberg that I've seen before include "that has hidden depths?" , "RMS Titanic's nemesis" , "Wrecker of Titanic" , "unemotional person" , "Large mass of floating ice" .)

I've seen this clue in The Irish Times.

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