Flying machines (8)
I believe the answer is:
aircraft
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flying machines</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 aircraft that I've seen before include "Machine capable of flight" , "Airbus A330 or 380, say" , "Airbus A380 or Boeing 777, say" , "means of transport" , "Airbus A380 or Boeing 747 say" .)