
1) Arm of the arctic 2) Mostly icebound body 3) Neighbor of the Arctic Ocean 4) Waters off Siberia
Found on
https://www.crosswordclues.com/clue/kara-sea

The Kara Sea (Ка́рское мо́ре, Karskoe More) is part of the Arctic Ocean north of Siberia. It is separated from the Barents Sea to the west by the Kara Strait and Novaya Zemlya, and the Laptev Sea to the east by the Severnaya Zemlya archipelago. It is named for the Kara River (flowing into Baydaratskaya Bay), which is now relatively in...
Found on
http://en.wikipedia.org/wiki/Kara_Sea

marginal sea of the Arctic Ocean, located off western Siberia (Russia), between the Novaya Zemlya islands (west), Franz Josef Land (northwest), and ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/k/11

Part of the Arctic Ocean off the north coast of the Russian Federation, bounded to the northwest by the island of Novaya Zemlya and to the northeast by Severnaya Zemlya; area 880,000 sq km/339,768 sq mi; average depths 30–100 m/98–328 ft, with a maximum of 620 m/2,034 ft. Novy Port on the Gulf of Ob is the chief port. ...
Found on
https://www.encyclo.co.uk/local/21221

an arm of the Arctic Ocean between Novaya Zemlya and the N Russian Federation.
Found on
https://www.infoplease.com/dictionary/kara-sea
No exact match found.