One sixteenth of an ounce in the avoirdupois system of weights (4)

I believe the answer is:

dram

(Other definitions for dram that I've seen before include "little weight" , "Small drink of spirits" , "Measure of spirits" , "Apothecary's weight, 60 grains" , "Pick-me-up" .)

I've seen this clue in The Mirror.

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