Unchanged by Times? Papers tempt one, surprisingly? (10)

I believe the answer is:

idempotent

'unchanged by times?' is the definition.
(unchanged by multiplication)

'papers tempt one surprisingly?' is the wordplay.
'papers' becomes 'ID' (identification papers).
'surprisingly?' indicates anagramming the letters (I've seen 'surprisingly' mean this).
'tempt'+'one'='temptone'
'temptone' anagrammed gives 'empotent'.
'id'+'empotent'='IDEMPOTENT'

I've seen this clue in The Guardian.

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