Because it’s followed by a shoot-out, indeed (8)
I believe the answer is:
forsooth
'indeed' is the definition.
('forsooth' can be a synonym of 'indeed')
'because it's followed by a shoot-out' is the wordplay.
'because' becomes 'for' (I've seen this before).
'it's followed by' means one lot of letters go next to another.
'out' indicates an anagram (out can mean wrong or inaccurate).
'shoot' is an anagram of 'sooth'.
'for'+'sooth'='FORSOOTH'
(Other definitions for forsooth that I've seen before include "In truth (arch)" , "truly" , "certainly" , "Marry" , "Indeed (archaic)" .)