Crossword Genius

Attractive young mother's crummy rhymes (5,5)

Ross

I believe the answer is:

yummy mummy

'attractive young mother's' is the definition.
(yummy mummy means an attractive young mother)

I don't understand how the rest of the clue works.

(Another definition for yummy mummy that I've seen is " Attractive parent".)

I've seen this clue in The Guardian.
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