Badge from Britain GI sniper brought back (8)
I believe the answer is:
insignia
'badge' is the definition.
(I know that insignia is a type of badge)
'from britain gi sniper brought back' is the wordplay.
'from' says the answer is hidden in the clue.
'brought back' shows that the letters should be reversed in order.
'aingisni' can be found hidden inside 'britain gi sniper'.
'aingisni' backwards is 'INSIGNIA'.
(Other definitions for insignia that I've seen before include "Badge worn to show official position" , "Stars and stripes, say" , "Distinguishing emblem or badge" , "Badge or emblems of office" , "military mark" .)