In next Rambo? One might get shot (5)
I believe the answer is:
extra
'one might get shot' is the definition.
(as in a TV or film extra)
'in next rambo?' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EXTRA' is hidden within 'next rambo'.
(Other definitions for extra that I've seen before include "Auxiliary" , "person in shot?" , "Bit actor in film" , "No great contribution to film" , "Bit actor in crowd scene" .)