Like electrons, for example, damaging to pencil (8)

I believe the answer is:

leptonic

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'like electrons for example' is the definition.
I can't tell whether this definition defines the answer.

'damaging to pencil' is the wordplay.
'damaging' indicates an anagram.
'to'+'pencil'='topencil'
'topencil' is an anagram of 'LEPTONIC'.

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