Age fuels change in fighter's body (8)

I believe the answer is:

fuselage

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'body' is the definition.
(fuselage is the body of a plane)

I don't understand the remainder of the clue.

(Other definitions for fuselage that I've seen before include "bodywork" , "body of fighter?" , "Long body" , "Main body of aircraft" , "part of aircraft" .)

I've seen this clue in The Sun.

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