Flight component (5)
I believe the answer is:
stair
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flight component</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stair that I've seen before include "Rising step" , "Tarsi (anag)" , "one's seen in flight" , "Indoor step" , "this could get one down" .)