Scientific study of heavenly bodies (9)
I believe the answer is:
astronomy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">scientific study of heavenly bodies</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for astronomy that I've seen before include "Scientific interest" , "Scientific study of stars and planets" , "Scientific study of the universe" , "Tory moans (anag.)" , "Stargazing" .)