Crossword Genius

In tucking the ends round, did the wrong thing (6)

Ross

I believe the answer is:

sinned

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

'did the wrong thing' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how one could define the other.

'in tucking the ends round' is the wordplay.
I cannot really understand how this works, but
'in' is found in the answer.
an anagram of 'ends' is 'sned' which is present in the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for sinned that I've seen before include "Violated a moral law" , "Gave moral offence" , "Transgressed the moral law" , "was wicked" , "trespassed" .)

I've seen this clue in the Evening Standard.
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