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Generally, a promotion includes rug with one-third off (2,1,4)

Ross

I believe the answer is:

as a rule

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

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

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(Other definitions for as a rule that I've seen before include "Usually, in the normal course" , "26 [NORMALLY]" , "Most of the time" , "how one might take a calibrated rod" , "Usually, in general" .)

I've seen this clue in The Times.
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