Age fuels changes in fighter's body (8)
I believe the answer is:
fuselage
'fighter's body' is the definition.
'fuselage' can be an answer for 'body' (fuselage is a kind of body). I am not certain of the 'fighter's' bit.
'age fuels changes' is the wordplay.
'changes' is an anagram indicator.
'age'+'fuels'='agefuels'
'agefuels' with letters rearranged gives 'FUSELAGE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for fuselage that I've seen before include "Body of plane" , "part of aircraft" , "is often up in the air" , "Aircraft's body" , "part of plane" .)