System of weights (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">system of weights</span>' is the definition.<br/ ><span class="explanation-format__explanation">(troy is a kind of system of weights)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for troy that I've seen before include "Weight system - old city" , "Iliad siege city" , "System of weights introduced by French" , "City destroyed" , "Ancient beseiged city" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">system of weights</span>' is the definition.<br/ ><span class="explanation-format__explanation">(avoirdupois is a kind of system of weights)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for avoirdupois that I've seen before include "sort of weight" , "Imperial system of weights - unwanted fat" , "Pounds/ounces system of weights" , "Non-metric system of weights" .)