Crossword Genius

Thin wire, in a bulb say (8)

Ross

I believe the answer is:

filament

(Other definitions for filament that I've seen before include "Wire in incandescent bulb" , "It glows in a light bulb" , "'Thin wire, in a bulb say (8)'" , "Slender thread - conducting wire" , "One may be incandescent" .)

I've seen this clue in The Irish Times.
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