Crossword Genius

With wrongly set kilts, I show organ (4,1,8)

Ross

I believe the answer is:

kist o whistles

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'with wrongly' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'set kilts i show organ' is the wordplay.
'set kilts i show' anagrams to 'KIST O WHISTLES'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Guardian.
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