Company will sound decisive (7)

I believe the answer is:

crucial

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'decisive' is the definition.
(similar in meaning)

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

(Other definitions for crucial that I've seen before include "Of vital importance" , "Pivotal" , "Of extreme importance" , "'Critical, vital (7)'" , "Decisive - very important" .)

I've seen this clue in The Guardian.

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