Planned in advance (12)
I believe the answer is:
premeditated
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">planned in advance</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 premeditated that I've seen before include "Thought out beforehand" , "Planned in advance" , "Considered" , "Planned beforehand" .)