Military display is tawdry stuff, as well (6)
I believe the answer is:
tattoo
'military display' is the definition.
(I've seen this before)
'tawdry stuff as well' is the wordplay.
'tawdry stuff' becomes 'tat' (I've seen this before).
'as well' becomes 'too' ('too' can be a synonym of 'as well').
'tat'+'too'='TATTOO'
'is' is the link.
(Other definitions for tattoo that I've seen before include "one has to beat" , "Engraving on skin" , "Indelible marks drawn on the skin" , "Drumbeat, or design on skin" , "Skin drawing" .)