Crossword Genius

Does dad keep quiet about her? (3)

Ross

I believe the answer is:

mum

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'does dad' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mum that I've seen before include "Informal palindromic mother" , "Tight-lipped" , "Keep quiet, mother" , "old lady" , "(Keep) silent; mother" .)

I've seen this clue in the Evening Standard.
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