Soldier puts nothing in report sent back (7)
I believe the answer is:
trooper
'soldier' is the definition.
(trooper is a kind of soldier)
'nothing in report sent back' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'in' means one lot of letters goes inside another.
'sent back' shows that the letters should be reversed in order.
'o' placed inside 'report' is 'repoort'.
'repoort' reversed gives 'TROOPER'.
'puts' is the link.
(Other definitions for trooper that I've seen before include "Cavalry 21" , "Soldier, proverbial swearer" , "Proverbially swearing soldier" , "Private soldier" , "ship" .)