Headey of "Game of Thrones" (4)

I believe the answer is:

lena

'headey of game of thrones' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for lena that I've seen is " River of Siberia (4400 km), the world's ninth longest".)

I've seen this clue in the Newsday and the LA Times.

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