Crossword Genius

Not speaking with relation? (3)

Ross

I believe the answer is:

mum

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'relation?' is the definition.
(I know that mum subproperty of parent (unspecified))

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for mum that I've seen before include "Mother - she's the word for secrecy" , "Parent - shtoom" , "Silence" , "Keep quiet, mother" , "Silent; parent" .)

I've seen this clue in The Mirror.
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