Bandage for first person seen with gun in draw (8)
I believe the answer is:
ligature
'bandage' is the definition.
(I've seen this before)
'first person seen with gun in draw' is the wordplay.
'first person' becomes 'i'.
'seen with' means one lot of letters go next to another.
'gun' becomes 'gat' (gat is a kind of gun).
'in' is an insertion indicator.
'draw' becomes 'lure' (I've seen this before).
'i'+'gat'='igat'
'igat' going within 'lure' is 'LIGATURE'.
'for' acts as a link.
(Other definitions for ligature that I've seen before include "Thread for sealing blood vessels" , "Cord for tying blood-vessels" , "Cord used to tie off in surgery" , "Bond" , "Tie (to restrict flow of blood)" .)