Brave person, or a sandwich (4)
I believe the answer is:
hero
I believe this clue is a double definition.
'brave person' is the first definition.
(I've seen this before)
'a sandwich' is the second definition.
(I know that hero is a type of sandwich)
(Other definitions for hero that I've seen before include "Principal character in a film or novel" , "Illustrious person" , "Rochester maybe required?" , "eg Hercules" , "Brave guy" .)