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Thing puncturing another – one's lighter (7)

Ross

I believe the answer is:

impaler

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'thing puncturing another' is the definition.
I know nothing about this answer so I can't judge whether this works.

'one's lighter' is the wordplay.
'one's' becomes 'I'm' ('one is' is a formal way of saying 'I am').
'lighter' becomes 'paler' ('pale' can be similar in meaning to 'light').
'im'+'paler'='IMPALER'

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(Another definition for impaler that I've seen is " murderous stakeholder".)

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