Crossword Genius

Good: a delicate form of illumination (8)

Ross

I believe the answer is:

gaslight

'form of illumination' is the definition.
(type of lighting)

'good a delicate' is the wordplay.
'good' becomes 'g' (abbreviation).
'delicate' becomes 'slight' (synonyms).
'g'+'a'+'slight'='GASLIGHT'

(Other definitions for gaslight that I've seen before include "Sort of illumination" , "Old guide in dark" , "Old film" , "Old form of illumination" , "Old-fashioned illumination" .)

I've seen this clue in The Times.
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