Smashed bulb may be so (3,2)
I believe the answer is:
lit up
I believe this clue is a double definition.
'smashed' is the first definition.
(thesaurus)
'bulb may be so' is the second definition.
(a lightbulb might be lit)
(Other definitions for lit up that I've seen before include "Prepared to smoke" , "Drunk (informal)" , "Drunk (as a bulb?)" , "bulb so transformed room?" , "like a bulb, perhaps?" .)