Mum, below, is likely to chatter in a rambling way (7)

I believe the answer is:

maunder

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'likely to chatter in a rambling way' is the definition.
I can't judge whether this defines the answer.

'mum below' is the wordplay.
'mum' becomes 'ma' (both can mean mother).
'below' becomes 'under' (synonyms).
'ma'+'under'='MAUNDER'

'is' is the link.

Can you help me to learn more?

(Other definitions for maunder that I've seen before include "ramble" , "Drivel" .)

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

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