Disembark in flames (6)
I believe the answer is:
alight
This clue is a double definition.
'disembark' is the first definition.
(I've seen this in another clue)
'in flames' is the second definition.
(alight can mean on fire or ablaze)
(Other definitions for alight that I've seen before include "Disembark; on fire" , "Step off the bus because it's on fire?" , "suffering from arson attack?" , "Brilliant" , "Touch down" .)