Pi expertly reworked with some confusion (10)
I believe the answer is:
perplexity
'some confusion' is the definition.
(perplexity is a kind of confusion)
'pi expertly reworked' is the wordplay.
'reworked' indicates an anagram.
'pi'+'expertly'='piexpertly'
'piexpertly' anagrammed gives 'PERPLEXITY'.
'with' acts as a link.
(Another definition for perplexity that I've seen is " Bewilderment".)
I've seen this clue in the Sydney Morning Herald.
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