Destiny sounds more peaceful (6)

I believe the answer is:

calmer

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'more peaceful' is the definition.
('calm' can be similar in meaning to 'peaceful')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for calmer that I've seen before include "Less frantic, more relaxed" , "More sedate" , "More peaceful" , "More on a level" , "Less windy" .)

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

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