Exceptionally sharp poet, one waxing enthusiastic (10)

I believe the answer is:

rhapsodist

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'one waxing enthusiastic' is the definition.
The definition suggests a singular noun which matches the answer.

'exceptionally sharp poet' is the wordplay.
'exceptionally' indicates an anagram.
'poet' becomes 'odist' (someone who writes odes).
'sharp' with letters rearranged gives 'rhaps'.
'rhaps'+'odist'='RHAPSODIST'

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I've seen this clue in The Times.

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