Science (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">science</span>' is the definition.<br/ ><span class="explanation-format__explanation">(physics is a kind of science)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for physics that I've seen before include "School science subject" , "Science of matter and energy" , "drugs" , "Purges" , "Properties-of-matter science" .)
(Other definitions for chemistry that I've seen before include "Why lovers love" , "A science (of personal attraction?)" , "scientific discipline" , "The science of matter" , "School subject - how individuals react to each other" .)