In accompanying the soldier, shows spirit (6)
I believe the answer is:
wraith
'spirit' is the definition.
(I've seen this before)
'in accompanying the soldier' is the wordplay.
'in' indicates putting letters inside.
'accompanying' becomes 'with' (I've seen this before).
'the soldier' becomes 'ra'.
'with' enclosing 'ra' is 'WRAITH'.
'shows' acts as a link.
(Other definitions for wraith that I've seen before include "Wrath I directed at spirit" , "Apparition, phantom, spirit" , "looking pale and thin" , "Making an emotional appeal" , "Deathly apparition" .)