Aircraft business (8)
I believe the answer is:
aviation
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">aircraft business</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aviation that I've seen before include "The practice or science of flying aircraft" , "Aircraft operating business" , "Air travel" , "Job; date" , "Mechanical flight" .)