Centre of interest (5)
I believe the answer is:
focus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">centre of interest</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 focus that I've seen before include "Spotlight" , "Concentrate, zero in" , "Maximum clarity of an idea" , "Zoom in (on)" , "Adjust camera lenses - concentrate" .)