Central London area (4)
I believe the answer is:
soho
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">central london area</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for soho that I've seen before include "Nightclub area in London" , "Central London night life district" , "London area; hunt call" , "London district known for its nightlife" , "Smoke's part" .)