Red makes Military Intelligence come out (6)
I believe the answer is:
commie
'red' is the definition.
(I know that commie is a type of red)
'military intelligence come out' is the wordplay.
'military intelligence' becomes 'MI' (as in MI5 or MI6 - British military intelligence).
'out' is an insertion indicator.
'mi' going into 'come' is 'COMMIE'.
'makes' is the link.
(Other definitions for commie that I've seen before include "Red" , "Extreme left-winger" , "Eg, Marxist (colloq.)" , "Left wing" .)