Crossword Genius

When you apply undue pressure about minor measures, it means business (8)

Ross

I believe the answer is:

commerce

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for commerce that I've seen before include "Transactions in goods and services" , "Trading exchanges" , "Business, industry, trade" , "Trading activity" , "Traffic" .)

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