Crossword Genius

Mother, hard of hearing, is starting threats, prepared to punch (4,1,4)

Ross

I believe the answer is:

made a fist

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'prepared to punch' is the definition.
I can't tell whether this defines the answer.

'mother hard of hearing is starting threats' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'hard of hearing' becomes 'deaf' (I've seen this before).
'starting' indicates taking the first letters.
The first letter of 'threats' is 't'.
'ma'+'deaf'+'is'+'t'='MADE A FIST'

Can you help me to learn more?

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