Large town or populous place (4)
I believe the answer is:
city
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">large town</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">populous place</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for city that I've seen before include "See 10" , "eg New York" , "Big conurbation" , "Important town" , "Eg, London, Coventry" .)