Crossword Genius

Awful description of first Russian tsar (8)

Ross

I believe the answer is:

terrible

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'awful' is the definition.
(I know that awful can be written as terrible)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for terrible that I've seen before include "Frightful" , "Appalling" , "Extremely bad" , "Atrocious" , "Really bad" .)

I've seen this clue in The Globe and Mail.
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