Yet another scale is inferior (5-4)

I believe the answer is:

third-rate

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(Other definitions for third-rate that I've seen before include "Of very poor quality" , "Very inferior in quality, using ordinal number" , "Very inferior in numerical way" , "Very inferior in quality - count down" , "Very inderior in quality - do a count" .)

I've seen this clue in The Mirror.

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