Land on fire (6)
I believe the answer is:
alight
I believe this is a double definition.
'land' is the first definition.
(alighting is a kind of landing)
'on fire' is the second definition.
(synonyms)
(Other definitions for alight that I've seen before include "suffering from arson attack?" , "(Of bird) settle" , "Land; burning" , "Step off the bus because it's on fire?" , "Get down from, say bus" .)