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Horrible ogre inspired by one of nine (8)

Ross

I believe the answer is:

gruesome

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'horrible' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gruesome that I've seen before include "'Ghastly, grisly (8)'" , "terrible" , "Repugnant" , "'Grisly, macabre (8)'" , "Horrifying and revolting" .)

I've seen this clue in The Irish Times.
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