Par (5)
(Other definitions for usual that I've seen before include "Customary - customary drink" , "not rum?" , "Stock" , "Standard" , "Normal, habitual" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">par</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for norm that I've seen before include "Typical pattern or situation" , "Benchmark" , "(The) accepted way" , "Bacterium, virus, etc" , "Required or acceptable standard" .)