In a straight line (2,3,4,5)
I believe the answer is:
as the crow flies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a straight line</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 as the crow flies that I've seen before include "move in a straight line" , "By direct route" , "How rook moves" , "without deviating" , "taking shortest route" .)