Rome, etc I discover to be so incredibly fast-track (8)

I believe the answer is:

meteoric

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'be so incredibly fast-track' is the definition.
I can't tell whether this definition defines the answer.

'rome etc i discover' is the wordplay.
'rome etc i' anagrams to 'METEORIC'.
But, I'm not clear how this is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for meteoric that I've seen before include "Remarkably quick" , "Remarkably rapid" , "flashing!" , "Dazzlingly quick, like a shooting star" , "(Of change) very rapid" .)

I've seen this clue in the Sydney Morning Herald.

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