Crossword Genius

Light source good with volatile plasma (3,4)

Ross

I believe the answer is:

gas lamp

'light source' is the definition.
(thesaurus)

'good with volatile plasma' is the wordplay.
'good' becomes 'g' (abbreviation).
'with' is a charade indicator (letters next to each other).
'volatile' indicates anagramming the letters.
'plasma' anagrammed gives 'aslamp'.
'g'+'aslamp'='GAS-LAMP'

(Other definitions for gas lamp that I've seen before include "Old illuminator" , "Source of illumination" , "Burning source of light" , "lighter" , "Bright object" .)

I've seen this clue in The Times.
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