Crossword Genius

What might suggest our US causing destruction? (7)

Ross

I believe the answer is:

ruinous

'causing destruction?' is the definition.
(I've seen this before)

'what might suggest our us' is the wordplay.
I cannot really understand how this works, but
'us' is found in the answer.
This explanation may well be incorrect...

(Other definitions for ruinous that I've seen before include "Destructive and causing downfall" , "ikely to cause harm" , "Devastating - dilapidated" , "Broken down" , "Destructive; dilapidated" .)

I've seen this clue in The Times.
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