Crossword Genius

Offence to have trails winding on the left (9)

Ross

I believe the answer is:

sinistral

'on the left' is the definition.
(I've seen this before)

'offence to have trails winding' is the wordplay.
'offence' becomes 'sin' (a sin is an offence or transgression).
'to have' says to put letters next to each other.
'winding' indicates anagramming the letters.
'trails' is an anagram of 'istral'.
'sin'+'istral'='SINISTRAL'

(Another definition for sinistral that I've seen is " Turning to the left".)

I've seen this clue in The Guardian.
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