Analysis of the structure of animals (7)
I believe the answer is:
anatomy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">analysis of the structure of animals</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for anatomy that I've seen before include "Branch of biology" , "Bodily structure of animal or plant" , "Study of bodies" , "Science of bodily structure" , "(Science of) physical structure of animals or plants" .)