A land in flames (6)
I believe the answer is:
alight
'in flames' is the definition.
(alight can mean on fire or ablaze)
'a land' is the wordplay.
'land' becomes 'light' (lighting is a kind of landing).
'a'+'light'='ALIGHT'
(Other definitions for alight that I've seen before include "Touch down" , "Get off the bus because it's on fire" , "(Of bird) settle" , "Get out of train" , "Disembark, land" .)