Science of farming (11)
I believe the answer is:
agriculture
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">science of farming</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 agriculture that I've seen before include "Land cultivation" , "Farming science" , "The practice of farming" , "Husbandry" .)