Business will always be important (6)

I believe the answer is:

matter

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'be important' is the definition.
(I've seen this before)

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

(Other definitions for matter that I've seen before include "Physical substance" , "Affair; be important" , "Substance as opposed to spirit" , "Stuff - mean something" , "Substance; be important" .)

I've seen this clue in the Evening Standard.

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