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Distort the last circle and fastening with a long, sharp pin (9)

Ross

I believe the answer is:

skewering

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'fastening with a long sharp pin' is the definition.
I can't tell whether this defines the answer.

'distort the last circle' is the wordplay.
'distort' becomes 'skew' (I've seen this in another clue).
'last' says to take the final letters.
'circle' becomes 'ring' (synonyms).
The last letter of 'the' is 'e'.
'skew'+'e'+'ring'='SKEWERING'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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