Refusal to purchase articles; senses a discrepancy (5,10)

I believe the answer is:

sales resistance

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'refusal to purchase articles senses a discrepancy' is the definition.
I can't tell whether this defines the answer.

'refusal to purchase articles senses a discrepancy' is the wordplay.
'articles senses a' anagrams to 'SALES RESISTANCE'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for sales resistance that I've seen before include "Reluctance to buy" , "Opposition shown to rep" .)

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

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