War cry makes less important European retreat in turn (8)
I believe the answer is:
geronimo
'war cry' is the definition.
(I've seen this before)
'less important european retreat in turn' is the wordplay.
'less important' becomes 'minor' (I've seen this before).
'european' becomes 'e' (abbreviation e.g. EU).
'retreat' says the letters should be written backwards.
'in' indicates putting letters inside.
'turn' becomes 'go' (a person's move in a board game**).
'minor'+'e'='minore'
'minore' back-to-front is 'eronim'.
'eronim' going inside 'go' is 'GERONIMO'.
'makes' is the link.
(Other definitions for geronimo that I've seen before include "Shout up high" , "shout during dive" , "I'm no ogre like famous Apache Indian chief" , "cry from bungee jumper?" , "helicopter paratroops' departure call?" .)