Crossword Genius

Weight system (11)

Ross

I believe the answer is:

avoirdupois

'weight system' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for avoirdupois that I've seen before include "Imperial system of weights - unwanted fat" , "Pounds/ounces system of weights" , "sort of weight" , "Non-metric system of weights" .)

I've seen this clue in The Guardian.
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