One used to snap and be tearful, upset by urgent news (9)
I believe the answer is:
flashbulb
'one used to snap' is the definition.
(used to snap a photograph)
'be tearful upset by urgent news' is the wordplay.
'be tearful' becomes 'blub' (to blub is to cry).
'upset' says the letters should be written backwards.
'by' is a charade indicator (letters next to each other).
'urgent news' becomes 'flash' (a newsflash).
'blub' reversed gives 'bulb'.
'bulb' after 'flash' is 'FLASHBULB'.
'and' acts as a link.
(Other definitions for flashbulb that I've seen before include "something generating red eyes?" , "It may help photograph" , "Old camera attachment" .)