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Striking both of us, undisguised horrific vertigo (9)

Ross

I believe the answer is:

giddiness

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

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(Other definitions for giddiness that I've seen before include "State of excitable frivolity" , "Vertigo" , "Excitability and frivolity" .)

I've seen this clue in The Telegraph.
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