Group of Norwegians work on, say, Cruise Missile? (8)
I believe the answer is:
tomahawk
'missile?' is the definition.
(axe that may be thrown as a missile)
'group of norwegians work on say cruise' is the wordplay.
'group of norwegians' becomes 'A-ha' (Norwegian pop group).
'work' becomes 'wk' (abbreviation).
'on' means one lot of letters go next to another.
'say cruise' becomes 'Tom' (actor Tom Cruise).
'aha'+'wk'='ahawk'
'ahawk' after 'tom' is 'TOMAHAWK'.
(Other definitions for tomahawk that I've seen before include "US native axe" , "War hatchet once wielded by native Americans" , "killer on reservation?" , "Brave's arm" , "Battle-axe" .)