Nylon grading unit (6)

I believe the answer is:

denier

(Other definitions for denier that I've seen before include "One refusing to admit" , "Measurement of fineness in silk, nylon etc" , "Unit of measurement for silk" , "Units of weight in silks, nylon and other yarns" , "Measure of the fineness of silk or nylon" .)

I've seen this clue in The Sun.

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