Design and build (8)
I believe the answer is:
engineer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">design and build</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 engineer that I've seen before include "One uses scientific knowledge to solve practical problems" , "Mechanic" , "Person in charge of building bridges, etc." , "Practical technologist" , "One uses science to solve practical problems" .)