Crossword Genius

A noise rings true for widow (7)

Ross

I believe the answer is:

astound

I'm a little stuck... Click here to teach me more about this clue!

'widow' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how one could define the other.

'a noise rings true for' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for astound that I've seen before include "Shock, surprise greatly" , "Flabbergast" , "Stagger" , "Stupefy" , "Amaze, astonish" .)

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