Science of animal life (7)
I believe the answer is:
zoology
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">science of animal life</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 zoology that I've seen before include "Science of animals" , "Science of animal life" , "The scientific study of animals" , "Animal study" .)