Crossword Genius

The weapon is hidden in a rug (3,3)

Ross

I believe the answer is:

air gun

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Sydney Morning Herald.
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