Land set on fire? (6)
I believe the answer is:
alight
This clue could be a double definition.
'land set' is the first definition.
'alight' can be an answer for 'land' (alighting is a kind of landing). I'm not sure about the 'set' bit.
'on fire?' is the second definition.
('alight' can be a synonym of 'on fire')
Can you help me to learn more?
(Other definitions for alight that I've seen before include "Get down from, say bus" , "Descend, being on fire" , "Brilliant" , "Come down - on fire" , "Get out of train" .)