Landed, advanced, and fired (4)
I believe the answer is:
alit
'landed' is the definition.
(I've seen this before)
'advanced and fired' is the wordplay.
'advanced' becomes 'a'.
'and' means one lot of letters go next to another.
'fired' becomes 'lit' (set on fire).
'a'+'lit'='ALIT'
(Other definitions for alit that I've seen before include "Landed" , "Climbed down from" , "got off" , "Came down to earth" , "Settled" .)