M. Poiret, no dud - but no Keats (5,4)

I believe the answer is:

minor poet

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'no keats' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'm poiret no dud' is the wordplay.
'dud' indicates an anagram.
'poiret'+'no'='poiretno'
'poiretno' is an anagram of 'inorpoet'.
'm'+'inorpoet'='MINOR POET'

'but' acts as a link.

Can you help me to learn more?

(Another definition for minor poet that I've seen is " No Wordsworth".)

I've seen this clue in The Guardian.

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