The weapon is hidden in a rug (3,3)
I believe the answer is:
air gun
'the weapon' is the definition.
(air gun is a kind of weapon)
'hidden in a rug' is the wordplay.
'in a rug' anagrams to 'AIR GUN'.
However, I'm unsure how this is indicated.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for air gun that I've seen before include "Pellet firer" , "Weapon firing pellets without explosives" , "Weapon that propels a projectile by compressed air" , "Weapon with small shot" , "Rifle firing pellets" .)