Crossword Genius

Make hasty tour of one archaeological site? (4)

Ross

I believe the answer is:

ruin

I'm a little stuck... Click here to teach me more about this clue!

'archaeological site?' is the definition.
(I've seen this in another clue)

'make hasty tour of one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
The remaining letters 'run' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ruin that I've seen before include "Catastrophe" , "financial disaster" , "Destory or bankrupt" , "loss of position" , "Disaster, collapse" .)

I've seen this clue in The Guardian.
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