Do vermin up poorly, no better (10)

I believe the answer is:

unimproved

'no better' is the definition.
(I've seen this before)

'do vermin up poorly' is the wordplay.
'poorly' is an anagram indicator (a poor spelling).
'do'+'vermin'+'up'='doverminup'
'doverminup' with letters rearranged gives 'UNIMPROVED'.

(Another definition for unimproved that I've seen is " no better".)

I've seen this clue in the Sydney Morning Herald.

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