Crossword Genius

Managed to collar canine that's released bit of ghastly gas (5)

Ross

I believe the answer is:

radon

'gas' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for radon that I've seen before include "Radioactive gas, linked to granite" , "Element, symbol Rn" , "A radioactive gas, symbol Rn" , "Inert gas - adorn (anag)" , "Rare noble gas" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.