Aircraft shed (6)
I believe the answer is:
hangar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">aircraft shed</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 hangar that I've seen before include "Large shed to house aircraft" , "Aircraft accommodation" , "Aircraft garage" , "Where aircraft may be" , "Structure where aircraft are maintained" .)