Crossword Genius

Building over frozen soil sees river rising (7)

Ross

I believe the answer is:

rotunda

'building' is the definition.
(I know that rotunda is a type of building)

I don't understand the rest of the clue.

(Other definitions for rotunda that I've seen before include "Round domed room" , "Round building or hall" , "Italian Pantheon, for instance" , "Round domed building" , "Do a turn (anag) -- circular domed building" .)

I've seen this clue in The Times.
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