Bulb glowing and radiating light is coruscating, first of all (6)

I believe the answer is:

garlic

'bulb' is the definition.
(garlic is a type of bulb)

'glowing and radiating light is coruscating first of all' is the wordplay.
'first of all' suggests taking the first letters.
The initial letters of 'glowing and radiating light is coruscating' is 'GARLIC'.

(Other definitions for garlic that I've seen before include "Pungent allium" , "Plant of the onion family" , "Culinary bulb" , "Flavouring bulb" , "Bulbous herb used in cooking" .)

I've seen this clue in The Telegraph.

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