Superweapon chosen involves cloak (6)
I believe the answer is:
poncho
'cloak' is the definition.
(I know that poncho is a type of cloak)
'superweapon chosen involves' is the wordplay.
'involves' indicates the answer is hidden within the clue.
'PONCHO' can be found hidden inside 'superweapon chosen'.
(Other definitions for poncho that I've seen before include "Kind of cloak like blanket with slit for head" , "Type of cloak" , "South American garment" , "Blanket-like garment" , "Overgarment with hole for head" .)