It's awfully bad of Ivan (8)

I believe the answer is:

terrible

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'bad of ivan' is the definition.
'terrible' can be an answer for 'bad' (thesaurus). I am unsure of the 'of ivan' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for terrible that I've seen before include "What precedes twos < and follows child in France" , "Atrocious" , "Really bad" , "Horrifying" , "Like tsar Ivan IV" .)

I've seen this clue in the Evening Standard.

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