Writer of poems enters one that's nonsense (9)

I believe the answer is:

sonneteer

'writer of poems' is the definition.

'enters one that's nonsense' is the wordplay.
'that's nonsense' indicates anagramming the letters.
'enters'+'one'='entersone'
'entersone' anagrammed gives 'SONNETEER'.

(Another definition for sonneteer that I've seen is " Poet".)

I've seen this clue in The Independent.

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