Crossword Genius

Bloomers produced by poor slums, say (8)

Ross

I believe the answer is:

alyssums

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'bloomers produced' is the definition.
I can't judge whether this definition defines the answer.

'poor slums say' is the wordplay.
'poor' indicates anagramming the letters.
'slums'+'say'='slumssay'
'slumssay' anagrammed gives 'ALYSSUMS'.

'by' is the link.

Can you help me to learn more?

(Another definition for alyssums that I've seen is " flowering plants".)

I've seen this clue in The Telegraph.
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