Shamefully ask sister for ***** (9)

I believe the answer is:

asterisks

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'shamefully ask sister for' is the definition.
I can't judge whether this definition defines the answer.

'shamefully ask sister for' is the wordplay.
'ask sister' can be anagrammed to 'ASTERISKS'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Another definition for asterisks that I've seen is " Star-shaped characters in printing".)

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

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