Centre of the solar system (3)
I believe the answer is:
sun
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">centre of the solar system</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 sun that I've seen before include "Star; newspaper" , "Our central star" , "Nearest star to Earth" , "Centre of a solar system" , "Shiny" .)