Tire, grabbing exercise? Energy is needed for body (8)
I believe the answer is:
fuselage
'body' is the definition.
(fuselage is a kind of body)
'tire grabbing exercise? energy is needed' is the wordplay.
'tire' becomes 'flag'.
'grabbing' indicates putting letters inside.
'exercise?' becomes 'use' (synonyms).
'energy' becomes 'e' (physics symbol as in E=mcs).
'is needed' is a charade indicator (letters next to each other).
'flag' placed around 'use' is 'fuselag'.
'fuselag'+'e'='FUSELAGE'
'for' acts as a link.
(Other definitions for fuselage that I've seen before include "part of plane" , "Aircraft's body" , "Main body of aircraft" , "Body of plane" , "is often up in the air" .)