Vulcan nonchalantly carries weapon (6)
I believe the answer is:
cannon
'weapon' is the definition.
(cannon is a kind of weapon)
'vulcan nonchalantly carries' is the wordplay.
'carries' says the answer is hidden in the clue.
'CANNON' is hidden in the letters of 'vulcan nonchalantly'.
(Other definitions for cannon that I've seen before include "Item of heavy artillery" , "Large gun mounted on wheels" , "shot playing billiards" , "Billiard shot in which player's ball hits the two others" , "Field gun" .)