It may be common or proper (4)
I believe the answer is:
noun
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">it may be common or proper</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 noun that I've seen before include "Category of word" , "Part of speech identifying a person, place or thing" , "Naming word (grammar)" , "Content word for person, place, thing etc" , "Identifying word (common or proper)" .)