Ogilvie regularly disembarked the German aircraft (6)
I believe the answer is:
glider
'aircraft' is the definition.
(glider is a kind of aircraft)
'ogilvie regularly disembarked the german' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'disembarked the german' becomes 'der' (I can't explain this - if you can you should believe this answer much more).
The alternating letters of 'ogilvie' are 'gli'.
'gli'+'der'='GLIDER'
Can you help me to learn more?
(Other definitions for glider that I've seen before include "Engineless aircraft" , "craft without power" , "Sailplane" , "Plane supported by air" , "quiet flier" .)