Work on body producing military display (6)
I believe the answer is:
tattoo
This clue is a double definition.
'work on body' is the first definition.
(work of art on someone's body)
'military display' is the second definition.
(I've seen this before)
'producing' is the link.
(Other definitions for tattoo that I've seen before include "that takes some beating?" , "Design worked on skin" , "drawing on arms, perhaps" , "Indelible picture made in the skin" , "Pointedly design" .)