Crossword Genius

Artist fellow is a gas! ... (5)

Ross

I believe the answer is:

radon

'a gas' is the definition.
(radon is a kind of gas)

'artist fellow' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'fellow' becomes 'don' (I've seen this before**).
'ra'+'don'='RADON'

'is' acts as a link.

(Other definitions for radon that I've seen before include "Noble gas, Rn" , "Natural gas considered a hazard to health" , "Inert gas that occurs naturally" , "Radioactive gas, linked to granite" , "Colourless gas, atomic number 86" .)

I've seen this clue in The Times.
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.